def get_comments_by_genus_type(self, comment_genus_type):
        """Gets a ``CommentList`` corresponding to the given comment genus ``Type`` which does not include comments of genus types derived from the specified ``Type``.

        arg:    comment_genus_type (osid.type.Type): a comment genus
                type
        return: (osid.commenting.CommentList) - the returned ``Comment``
                list
        raise:  NullArgument - ``comment_genus_type`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*

        """
        # Implemented from template for
        # osid.resource.ResourceLookupSession.get_resources_by_genus_type
        # NOTE: This implementation currently ignores plenary view
        collection = JSONClientValidated('commenting',
                                         collection='Comment',
                                         runtime=self._runtime)
        result = collection.find(
            dict({'genusTypeId': str(comment_genus_type)},
                 **self._view_filter())).sort('_id', DESCENDING)
        return objects.CommentList(result, runtime=self._runtime, proxy=self._proxy)
Gets a ``CommentList`` corresponding to the given comment genus ``Type`` which does not include comments of genus types derived from the specified ``Type``.

        arg:    comment_genus_type (osid.type.Type): a comment genus
                type
        return: (osid.commenting.CommentList) - the returned ``Comment``
                list
        raise:  NullArgument - ``comment_genus_type`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*