. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Obthisina 1. Dorsal valve qf a small individual. Fig. 2. Dorsal valve of a larger individual. AMBOCCELIA GREGARIA ( ). Compare with Atrypa unguiculus, Sowerby, Geol. Transjotions, Vol. v, pi. 54, f. unguiculus, Phillips, Pal. Fossils, p^. 28, f. unguiculus, Hall, Geol. Report Fourth District of New-York, p. 268, f. 6 a, 6, c, d; p. 267. Shell subhemispherical, wi
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Obthisina 1. Dorsal valve qf a small individual. Fig. 2. Dorsal valve of a larger individual. AMBOCCELIA GREGARIA ( ). Compare with Atrypa unguiculus, Sowerby, Geol. Transjotions, Vol. v, pi. 54, f. unguiculus, Phillips, Pal. Fossils, p^. 28, f. unguiculus, Hall, Geol. Report Fourth District of New-York, p. 268, f. 6 a, 6, c, d; p. 267. Shell subhemispherical, wider than long : hinge-line straight; cardinal anglesrounded. Ventral valve gibbous, marked by a shallow mesial sinus, which ex-tends from near the beak to the base of the shell: beak obtuse, strongly valve semielliptical, depressed convex, with/sometimes a slight longitudi-nal central depression; foveal plates slender and species differs from ^. umbonata in the less r^jgular convexity of the ventral valve, the greater convexity of the dorsal valvefiynjd the proportionally greater transverse diameter. I had originally considered this shell as identical with
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
