. Bulletins of American paleontology. MoLLUSKs Caribbean Coast Panama: Olsson & McGinty 49 II. Posterior-dorsal area marked with one or more secondary lines of sharp divarication, the resulting pattern, therefore, distinctly zigzagged. 3. Posterior-dorsal area with a single, median line of zigzag flexure. c. Shell small (length, 7 mm. or less) rounded, plump. White with rose-colored umbones S. pisifoniiis (Linne) d. Shell larger (above 10 mm.), relatively solid. Color white except the umbones and interior which are often colored rose-red S. pilsbryi, new species 4. Posterior-dorsal area wi
. Bulletins of American paleontology. MoLLUSKs Caribbean Coast Panama: Olsson & McGinty 49 II. Posterior-dorsal area marked with one or more secondary lines of sharp divarication, the resulting pattern, therefore, distinctly zigzagged. 3. Posterior-dorsal area with a single, median line of zigzag flexure. c. Shell small (length, 7 mm. or less) rounded, plump. White with rose-colored umbones S. pisifoniiis (Linne) d. Shell larger (above 10 mm.), relatively solid. Color white except the umbones and interior which are often colored rose-red S. pilsbryi, new species 4. Posterior-dorsal area with two or more lines of zigzag flexure; color usually pure white S. n/irabilis (Philippi) {jlexuosa Say, preoccuppied). 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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