. Bulletins of American paleontology. Gl.(1B(1TRlNCANA IN CoiOMHIA: ('I 21 increasingly raised in the adult stage; the test is spmose; on the umbilical side, the sutures are radial and depressed, -the chambers slightly inflated. Ihe forms arc quite similar to CIt. ventricosa (\\'hite), as described in detail by Mornod, 1949. The only remain- ing distinctive characteristic: the strongly developed umbilical thick- enmg. Git. ventricosa of Mornod (op. cit. fig. 85/3a-c) may belong to this type of transitional form, but due to the strong umbilical thickening should still belong to the Git.
. Bulletins of American paleontology. Gl.(1B(1TRlNCANA IN CoiOMHIA: ('I 21 increasingly raised in the adult stage; the test is spmose; on the umbilical side, the sutures are radial and depressed, -the chambers slightly inflated. Ihe forms arc quite similar to CIt. ventricosa (\\'hite), as described in detail by Mornod, 1949. The only remain- ing distinctive characteristic: the strongly developed umbilical thick- enmg. Git. ventricosa of Mornod (op. cit. fig. 85/3a-c) may belong to this type of transitional form, but due to the strong umbilical thickening should still belong to the Git. tricarinata type. Dimensions of holotype.—Width x mm.; thickness, mm. Holotype.—No. 20827, Paleontological Research Institution. Occurrence.—Manaure shale; frequent at the bottom of Colon shale {PuJlenia cretacea zone). Holotype (PI. 1, fig. 3a-c) from the Colon shale, Pullenia cretacea zone, Molmo section, S. 12141. Remarks.—The form shows a side view which is identical to Git. tricarinata ((Juereau 1893, pi. 5, fig. 3). As is known, this form is named only from thin section. Later the authors made pictures of Git. tricarinata which show all the same typical axial sections, but the number, shape, and arrangement of chambers (fig. 6) differ considerably. Therefore, the problem arises which of those forms, including ours, is to be identified with the original of Quereau. Since, however, it is here believed that many forms of "tricarinata type" are perhaps present m the original material, and since there is no possibilit\" for the writer to check it, the forms figured by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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