. Bulletins of American paleontology. . Cryptonatica janthostoma Text-figure 13. —Ontogenetic (solid arrow) and adult variations of (la-b) Crypionalica clausa (Broderip and Sowerby, 1829). (2a-c) C. janthostoma (Deshayes. 1839), and (3a-c) C. a«t/o( (Nomura, 1935b). Juvenile (2a) of C janthostoma commonly has a slightly open umbilicus at its posterior portion where the sulcus is distinctly incised (arrow a), and umbilicus of the adult (2b) is always weakly open at the same portion (arrow b) as the Please note that these images are extracted from scanned page images that may have bee
. Bulletins of American paleontology. . Cryptonatica janthostoma Text-figure 13. —Ontogenetic (solid arrow) and adult variations of (la-b) Crypionalica clausa (Broderip and Sowerby, 1829). (2a-c) C. janthostoma (Deshayes. 1839), and (3a-c) C. a«t/o( (Nomura, 1935b). Juvenile (2a) of C janthostoma commonly has a slightly open umbilicus at its posterior portion where the sulcus is distinctly incised (arrow a), and umbilicus of the adult (2b) is always weakly open at the same portion (arrow b) as the 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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