. Bulletins of American paleontology. 45 Trinidad Cretaceous Globigerinidae: Bronnimann 45 the Cushman Collection, U. S. National Museum, Washington, D. C Occurrence,—Globotruncana mayaroensh zone. Rather scarce. Remarks.—The subspecies subcarinata is closelj' related to mes- sxnae and transitional forms are difficult to assign. Most of the tests however can be classified without difficulty. As a rule, subcarinata is more compressed, coarser ornamented and stronger evolute than the non-carinate central type. In addition the liplike projection is better developed in messinae than in subcarinata
. Bulletins of American paleontology. 45 Trinidad Cretaceous Globigerinidae: Bronnimann 45 the Cushman Collection, U. S. National Museum, Washington, D. C Occurrence,—Globotruncana mayaroensh zone. Rather scarce. Remarks.—The subspecies subcarinata is closelj' related to mes- sxnae and transitional forms are difficult to assign. Most of the tests however can be classified without difficulty. As a rule, subcarinata is more compressed, coarser ornamented and stronger evolute than the non-carinate central type. In addition the liplike projection is better developed in messinae than in subcarinata. Early ontogenetic stages of the 2 subspecies are almost Text fig. 21. Globlgerlnella messinae subcarinata Bronnimann. T. L. L. Cat. Nos. 155591-155594. Globotruncana mayaroensis zone, Guayaguayare beds, Upper All appr. X 80. (a,b) Same specimen, umbilical and apertural views. Holotype. (c,d) Same specimen, umbilical and apertural views. (e,f) Same .specimen, umbilical and apertural views, () Same specimen, umbilical and apertural views. (i,k) Same specimen, umbilical and apertural views. (l,m) Same specimen, umbilical and apertural 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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