. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 261 Genes SPHEXOTUS. Hall. [Ety.: Sphen, wedge; ous, ear.] (1884: Pal. N. Y., Vol. V., Pt. I., p. xxxiii.) Shells with equal, very inequilateral, valves, elongate sub- trapezoidal or cylindrical in outline. The anterior end is short, and the posterior end usually obliquely truncate. A long, straight hinge^line; a well-marked umbonal ridge, with a secondary ridge usually occurring on the slope above it; a more or less defined oblique cincture; two short cardi- nal, and two slender latera
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 261 Genes SPHEXOTUS. Hall. [Ety.: Sphen, wedge; ous, ear.] (1884: Pal. N. Y., Vol. V., Pt. I., p. xxxiii.) Shells with equal, very inequilateral, valves, elongate sub- trapezoidal or cylindrical in outline. The anterior end is short, and the posterior end usually obliquely truncate. A long, straight hinge^line; a well-marked umbonal ridge, with a secondary ridge usually occurring on the slope above it; a more or less defined oblique cincture; two short cardi- nal, and two slender lateral, teeth; external ligament, lodged in a slender groove, and concentric surface stria1, character- ize this genus. Sphexotes truncates. (Conrad.) (Fig. 180.) (Pal. , Vol. Y., Pt. I., p. 394, PL LXV.) Distinguishing Characters.— Small size; straight base, slightly constricted anterior to the middle; angular umbonal. Fig. 180. Sphenotus truncatus. Specimen retaining both valves, x 2; left and right valves (from Hall). ridge; obscure umbonal fold; shallow cincture; very fine radiating stria?. Found in the Demissa bed, at Section 5 (very rare). Genus CONOCARDIUM. Bronx. [Ety.: Konos, cone; kardia, heart.] (1835: Lethsea Geognostica, Vol. I., p. 92.) Shells with equal inequilateral valves of a trigonal or spindle-shaped outline. The anterior* end is obliquely trun- cated, and along the cardinal line it is produced into a tube, which is often broken away, leaving an opening. The * I follow Zittel in regarding the truncated end as the anterior 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 Buffalo Society of Natural Sciences. Buffalo, N. Y. : The Society
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