. 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. IFiG. 4. The interior of the ventral valve, showing foramen, area, etc. enlarged. Fig. 5. Interior of the dorsal valve enlarged, showing the foveal plates, dental sockets, and the quadripartite muscular impression; the valve slightly 6. A similarly enlarged dorsal valve, showing some variations from the preceding. Geological relations. The lowest position-in which this genus is known is i
. 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. IFiG. 4. The interior of the ventral valve, showing foramen, area, etc. enlarged. Fig. 5. Interior of the dorsal valve enlarged, showing the foveal plates, dental sockets, and the quadripartite muscular impression; the valve slightly 6. A similarly enlarged dorsal valve, showing some variations from the preceding. Geological relations. The lowest position-in which this genus is known is inthe Marcellus shale, where we have a single species. There are three species in theHamilton group, one in the Chemung group, and one in the Coal measures. GENUS VITULINA ( n. g.).[ Lat. Vitula, a goddess.]Generic description. Shell planoconvex, semielliptical, marked by four or fivesimple rounded plications on either side of the mesial fold and sinus. Ventralvalve very convex, gibbous in old specimens; the mesial fold consisting of twolarger plications, with a shallow depression between them. Dorsal valve de-pressed convex or nearly flat, with a defined mesial sinus, in the bottom ofwh
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
