diff --git a/.github/workflows/consistency-checks.yml b/.github/workflows/consistency-checks.yml
index ea3742c34..0cbf4dc4c 100644
--- a/.github/workflows/consistency-checks.yml
+++ b/.github/workflows/consistency-checks.yml
@@ -35,3 +35,4 @@ jobs:
     - name: Test Mathics Consistency and Style
       run: |
         make check-consistency-and-style
+        make check-builtin-manifest
diff --git a/SYMBOLS_MANIFEST.txt b/SYMBOLS_MANIFEST.txt
index 43c6e2162..47d30dde6 100644
--- a/SYMBOLS_MANIFEST.txt
+++ b/SYMBOLS_MANIFEST.txt
@@ -1,4 +1,3 @@
-CombinatoricaOld`BinarySearch
 HTML`DataImport
 HTML`FullDataImport
 HTML`HyperlinksImport
@@ -40,6 +39,7 @@ System`$Machine
 System`$MachineEpsilon
 System`$MachineName
 System`$MachinePrecision
+System`$MaxLengthIntStringConversion
 System`$MaxMachineNumber
 System`$MaxPrecision
 System`$MinMachineNumber
@@ -105,7 +105,6 @@ System`Apart
 System`Append
 System`AppendTo
 System`Apply
-System`ApplyLevel
 System`ArcCos
 System`ArcCosh
 System`ArcCot
@@ -134,10 +133,12 @@ System`Attributes
 System`Automatic
 System`Axes
 System`Axis
+System`Background
 System`BarChart
 System`BaseForm
 System`Begin
 System`BeginPackage
+System`BellB
 System`BernoulliB
 System`BernsteinBasis
 System`BesselI
@@ -197,6 +198,7 @@ System`ChartLegends
 System`ChebyshevT
 System`ChebyshevU
 System`Check
+System`CheckAbort
 System`ChessboardDistance
 System`Chop
 System`Circle
@@ -238,6 +240,7 @@ System`ConditionalExpression
 System`Cone
 System`Cone3DBox
 System`Conjugate
+System`ConjugateTranspose
 System`Constant
 System`ConstantArray
 System`ContainsOnly
@@ -322,6 +325,8 @@ System`Dispatch
 System`Divide
 System`DivideBy
 System`Divisible
+System`DivisorSigma
+System`DivisorSum
 System`Divisors
 System`Do
 System`Dodecahedron
@@ -355,12 +360,14 @@ System`Erf
 System`Erfc
 System`Erosion
 System`EuclideanDistance
+System`EulerE
 System`EulerGamma
 System`EulerPhi
 System`Evaluate
 System`EvenQ
 System`ExactNumberQ
 System`Except
+System`Exit
 System`Exp
 System`ExpIntegralE
 System`ExpIntegralEi
@@ -526,6 +533,8 @@ System`Integer
 System`IntegerDigits
 System`IntegerExponent
 System`IntegerLength
+System`IntegerPart
+System`IntegerPartitions
 System`IntegerQ
 System`IntegerReverse
 System`IntegerString
@@ -543,6 +552,7 @@ System`InverseGudermannian
 System`InverseHaversine
 System`JaccardDissimilarity
 System`JacobiP
+System`JacobiSymbol
 System`Join
 System`Joined
 System`KelvinBei
@@ -554,6 +564,7 @@ System`Keys
 System`Khinchin
 System`KnownUnitQ
 System`KroneckerProduct
+System`KroneckerSymbol
 System`Kurtosis
 System`LABColor
 System`LCHColor
@@ -574,9 +585,9 @@ System`LessEqual
 System`LetterCharacter
 System`LetterNumber
 System`LetterQ
-System`LeviCivitaTensor
 System`Level
 System`LevelQ
+System`LeviCivitaTensor
 System`LightBlue
 System`LightBrown
 System`LightCyan
@@ -600,6 +611,7 @@ System`ListLinePlot
 System`ListLogPlot
 System`ListPlot
 System`ListQ
+System`ListStepPlot
 System`Listable
 System`LoadModule
 System`Locked
@@ -612,6 +624,7 @@ System`LogisticSigmoid
 System`Longest
 System`Lookup
 System`LowerCaseQ
+System`LucasL
 System`MachineNumberQ
 System`MachinePrecision
 System`Magenta
@@ -619,6 +632,7 @@ System`MakeBoxes
 System`ManhattanDistance
 System`MantissaExponent
 System`Map
+System`MapApply
 System`MapAt
 System`MapIndexed
 System`MapThread
@@ -642,6 +656,7 @@ System`Medium
 System`MemberQ
 System`MemoryAvailable
 System`MemoryInUse
+System`MersennePrimeExponent
 System`Mesh
 System`Message
 System`MessageName
@@ -655,6 +670,7 @@ System`Missing
 System`Mod
 System`ModularInverse
 System`Module
+System`MoebiusMu
 System`MorphologicalComponents
 System`Most
 System`Multinomial
@@ -760,6 +776,7 @@ System`PolyGamma
 System`Polygon
 System`Polygon3DBox
 System`PolygonBox
+System`PolygonalNumber
 System`PolynomialQ
 System`Position
 System`Positive
@@ -768,6 +785,7 @@ System`Postfix
 System`Power
 System`PowerExpand
 System`PowerMod
+System`PowersRepresentations
 System`PreDecrement
 System`PreIncrement
 System`Precedence
@@ -793,6 +811,7 @@ System`PseudoInverse
 System`Purple
 System`Put
 System`PutAppend
+System`PythonCProfileEvaluation
 System`PythonForm
 System`QRDecomposition
 System`Quantile
@@ -827,8 +846,8 @@ System`ReadProtected
 System`Real
 System`RealAbs
 System`RealDigits
-System`RealNumberQ
 System`RealSign
+System`RealValuedNumberQ
 System`Reals
 System`Reap
 System`Record
@@ -855,6 +874,7 @@ System`ResetDirectory
 System`Rest
 System`Return
 System`Reverse
+System`ReverseSort
 System`Riffle
 System`Right
 System`RogersTanimotoDissimilarity
@@ -886,6 +906,7 @@ System`Set
 System`SetAttributes
 System`SetDelayed
 System`SetDirectory
+System`SetEnvironment
 System`SetFileDate
 System`SetOptions
 System`SetStreamPosition
@@ -925,6 +946,7 @@ System`SplitBy
 System`Sqrt
 System`SqrtBox
 System`SquaredEuclideanDistance
+System`SquaresR
 System`StandardDeviation
 System`StandardForm
 System`StartOfLine
diff --git a/admin-tools/build_and_check_manifest.py b/admin-tools/build_and_check_manifest.py
index 9a8400068..2a1c33fdb 100755
--- a/admin-tools/build_and_check_manifest.py
+++ b/admin-tools/build_and_check_manifest.py
@@ -5,7 +5,7 @@
 from mathics.core.builtin import Builtin
 from mathics.core.load_builtin import (
     import_and_load_builtins,
-    modules,
+    mathics3_builtins_modules,
     name_is_builtin_symbol,
 )
 
@@ -15,7 +15,7 @@
 def generate_available_builtins_names():
     msg = ""
     builtins_by_name = {}
-    for module in modules:
+    for module in mathics3_builtins_modules:
         vars = dir(module)
         for name in vars:
             var = name_is_builtin_symbol(module, name)
diff --git a/mathics/builtin/atomic/strings.py b/mathics/builtin/atomic/strings.py
index 72326d7b7..22291b7ec 100644
--- a/mathics/builtin/atomic/strings.py
+++ b/mathics/builtin/atomic/strings.py
@@ -411,14 +411,16 @@ class HexadecimalCharacter(Builtin):
 
 # This isn't your normal Box class. We'll keep this here rather than
 # in mathics.builtin.box for now.
-class InterpretationBox(PrefixOperator):
+# mmatera commenct: This does not even exist in WMA. \! should be associated
+# to `ToExpression`, but it was not  properly implemented by now...
+class InterpretedBox(PrefixOperator):
     r"""
     <url>
     :WMA link:
     https://reference.wolfram.com/language/ref/InterpretationBox.html</url>
 
     <dl>
-      <dt>'InterpretationBox[$box$]'
+      <dt>'InterpretedBox[$box$]'
       <dd>is the ad hoc fullform for \! $box$. just for internal use...
     </dl>
 
@@ -430,7 +432,7 @@ class InterpretationBox(PrefixOperator):
     summary_text = "interpret boxes as an expression"
 
     def eval(self, boxes, evaluation: Evaluation):
-        """InterpretationBox[boxes_]"""
+        """InterpretedBox[boxes_]"""
         # TODO: the following is a very raw and dummy way to
         # handle these expressions.
         # In the first place, this should handle different kind
diff --git a/mathics/builtin/files_io/filesystem.py b/mathics/builtin/files_io/filesystem.py
index f0faf505e..59a7fea58 100644
--- a/mathics/builtin/files_io/filesystem.py
+++ b/mathics/builtin/files_io/filesystem.py
@@ -346,63 +346,6 @@ def eval(self, evaluation: Evaluation):
         return String(result)
 
 
-class DirectoryName(Builtin):
-    """
-    <url>:WMA link:https://reference.wolfram.com/language/ref/DirectoryName.html</url>
-
-    <dl>
-      <dt>'DirectoryName["$name$"]'
-      <dd>extracts the directory name from a filename.
-    </dl>
-
-    >> DirectoryName["a/b/c"]
-     = a/b
-
-    >> DirectoryName["a/b/c", 2]
-     = a
-    """
-
-    messages = {
-        "string": "String expected at position 1 in `1`.",
-        "intpm": ("Positive machine-sized integer expected at " "position 2 in `1`."),
-    }
-
-    options = {
-        "OperatingSystem": "$OperatingSystem",
-    }
-    summary_text = "directory part of a filename"
-
-    def eval_with_n(self, name, n, evaluation: Evaluation, options: dict):
-        "DirectoryName[name_, n_, OptionsPattern[DirectoryName]]"
-
-        if n is None:
-            expr = to_expression("DirectoryName", name)
-            py_n = 1
-        else:
-            expr = to_expression("DirectoryName", name, n)
-            py_n = n.to_python()
-
-        if not (isinstance(py_n, int) and py_n > 0):
-            evaluation.message("DirectoryName", "intpm", expr)
-            return
-
-        py_name = name.to_python()
-        if not (isinstance(py_name, str) and py_name[0] == py_name[-1] == '"'):
-            evaluation.message("DirectoryName", "string", expr)
-            return
-        py_name = py_name[1:-1]
-
-        result = py_name
-        for i in range(py_n):
-            (result, tmp) = osp.split(result)
-
-        return String(result)
-
-    def eval(self, name, evaluation: Evaluation, options: dict):
-        "DirectoryName[name_, OptionsPattern[DirectoryName]]"
-        return self.eval_with_n(name, None, evaluation, options)
-
-
 class DirectoryStack(Builtin):
     """
     <url>:WMA link:https://reference.wolfram.com/language/ref/DirectoryStack.html</url>
diff --git a/mathics/builtin/numbers/constants.py b/mathics/builtin/numbers/constants.py
index fc9067197..2f4e4a1d6 100644
--- a/mathics/builtin/numbers/constants.py
+++ b/mathics/builtin/numbers/constants.py
@@ -756,3 +756,8 @@ class Underflow(Builtin):
     instance = cls(expression=False)
     val = instance.get_constant()
     NUMERICAL_CONSTANTS[instance.symbol] = MachineReal(val.value)
+
+# Remove these variables to prevent errors in the SYMBOL_MANIFEST check.
+del cls
+del instance
+del val