. Bulletins of American paleontology. 440 Bulletin 238 Dielasmella larga, n. sp. PI. 14, figs. la-5e; Text-fig. 55 Larger than average for the genus, unequally biconvex, the pedicle valve being more inflated than the brachial valve; subpenta- gonal in outline, longer than wide, greatest width and greatest thickness posterior to mid-length; anterior and lateral profiles sub- lenticular; fold and sulcus lacking, anterior commissure rectimargin- ate; pedicle valve arched umbonally but becoming medially flattened anteriorly in large specimens; brachial valve may also be medially flattened or weakl
. Bulletins of American paleontology. 440 Bulletin 238 Dielasmella larga, n. sp. PI. 14, figs. la-5e; Text-fig. 55 Larger than average for the genus, unequally biconvex, the pedicle valve being more inflated than the brachial valve; subpenta- gonal in outline, longer than wide, greatest width and greatest thickness posterior to mid-length; anterior and lateral profiles sub- lenticular; fold and sulcus lacking, anterior commissure rectimargin- ate; pedicle valve arched umbonally but becoming medially flattened anteriorly in large specimens; brachial valve may also be medially flattened or weakly grooved, ordinarily forming a moderately to sharply truncated front margin; flanks of large specimens obscurely costate, the costae being simple, widely spaced and originating near the umbones; umbones and flattened medial portions of valves smooth; growth varices strong, irregularly and infrequently 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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