. Bulletins of American paleontology. 142 Bulletin 255 phragm body ch cylindroi^des. 0 10 20 30 40 50 60 70 80 90 100 110 D (mm) 120 130 Text-fig. 49.— Scatter \vith growth lines for density of secondaries (num- ber per half whorl) vs. diameter (S:D) for Docidoccras (PscudociJoccras), n. spp. and D. (Trilohiticiras ?), n. sp. indet., PscuJocidocrras zonule of Wide Bay (same symbols as Text-fig. 47). Note that there is large overlap for the phragmocones of D. (P.) ividcbayensr, n. sp. and D. (P.) camachoi, n. sp., buti clear separation for the body chambers, that D. (Trilobiticeras ?) sp. plots
. Bulletins of American paleontology. 142 Bulletin 255 phragm body ch cylindroi^des. 0 10 20 30 40 50 60 70 80 90 100 110 D (mm) 120 130 Text-fig. 49.— Scatter \vith growth lines for density of secondaries (num- ber per half whorl) vs. diameter (S:D) for Docidoccras (PscudociJoccras), n. spp. and D. (Trilohiticiras ?), n. sp. indet., PscuJocidocrras zonule of Wide Bay (same symbols as Text-fig. 47). Note that there is large overlap for the phragmocones of D. (P.) ividcbayensr, n. sp. and D. (P.) camachoi, n. sp., buti clear separation for the body chambers, that D. (Trilobiticeras ?) sp. plots within the distribution of the macroconchiate D. (Pscudocidoceras), and that the holotype of the type species D. (D.) cylindroidcs Buckman resembles D. (P.) camachoi in this parameter. pressed, lenticular, about double as wide as high, with evenly rounded broad externside, distinct circa-mechan lateral edge and rounded inner flanks which reach the umbilical seam almost ver- tically. Prosoradiate primaries extend hom the umbilical seam up to the lateral edge where they carry small nodes. The densely spaced secondaries project strongly and cross convexly, sometimes with median weakening, over the broad externside. The morphogeny is well known beyond 15 mm diameter. As shown in the scatter cHagrams (Text-figs. 47, 48), there is little change in the growth rate for whorl shape and coiling up to the end of tlie phragmocone. Whorl width varies from 64 to 82 percent. 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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