. Bulletins of American paleontology. 152 Bulletin 255. Text-fig. 50. — Cross-section of Docido- crras \^}Pseudocidoceras or n. subgen.], n. sp. indet. B, incomplete phragmocone, loc. WA 3 at the base of the E. amplcc- icns zonule (McM J 930) ; X 1- whorls of the phragmocone (9 to 10 per halfwhorl) which, on the inner whorls, are molcletl into the subsequent umbilical seam. The secondaries are moderately strong, rather dense (10 per halfwhorl) and weakly prosoradiate. The body chamber remains strongly depressed with dominant quasi-midlateral nodes or spines; the inner flanks are smooth, the se
. Bulletins of American paleontology. 152 Bulletin 255. Text-fig. 50. — Cross-section of Docido- crras \^}Pseudocidoceras or n. subgen.], n. sp. indet. B, incomplete phragmocone, loc. WA 3 at the base of the E. amplcc- icns zonule (McM J 930) ; X 1- whorls of the phragmocone (9 to 10 per halfwhorl) which, on the inner whorls, are molcletl into the subsequent umbilical seam. The secondaries are moderately strong, rather dense (10 per halfwhorl) and weakly prosoradiate. The body chamber remains strongly depressed with dominant quasi-midlateral nodes or spines; the inner flanks are smooth, the secondaries become blunt, stronger prosoradiate and, on the in- ternal mold, partly obsolete. The aperture is simple with moderate- ly oblicpie peristome, slight constriction and weak collar. Affinities. —^\\h specimen may be a strongly 'coronate' D. (Psrndocidoceras): however, it is distinguished by the spines, tlie blunt primaries and tlie almost rectiradiate secondaries. The body chamber shows close affinities to South American Pseiidotoites, and the whole shell resembles P. (?) (n. subgen.) .sphaeroceroides (Tornquist) (see VV^estermann, 1964b, pi. 9, fig. 7); however, the whorls are not ovate and the secondaries stronger and almost straight. This species is probably closely related with the associated D. ? (Pseiidocidoccras?) paucinodosurn, n. sp. which is distinguished by somewhat smaller, less depressed and less ornate whorls. Measurements. — Dmm W7f H% U% McM 1930 (apert.) (phragm.) — 54 67 35 — 9-10 () 41 9 40. 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. ]
Size: 1374px × 1819px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorpaleontologicalresearchinstitutionit, bookcentury1900
