. 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. e general form and surface-characters of the species of this genusresemble those of Retzia serpentina, R. vera and it. verneuili ; but thesmaller mesial plications are distinctive, and the hinge-structure and areaare conspicuously different. The extremity of the beak is perforate, and * This figure is about twice as large as any specimen of R. ferita which I These figures are from the 12th Rep
. 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. e general form and surface-characters of the species of this genusresemble those of Retzia serpentina, R. vera and it. verneuili ; but thesmaller mesial plications are distinctive, and the hinge-structure and areaare conspicuously different. The extremity of the beak is perforate, and * This figure is about twice as large as any specimen of R. ferita which I These figures are from the 12th Rep. on the State Cabinet, and Vol. iii, Pal. [Senate, No. 8 58 SIXTEENTH REPORT ON THE CABINET OF NAT. HISTORY. there is a triangular slit below, whicli may sometimes be filled by deltoidalpieces. The dorsal valve has a broad flattened cardinal process, which dis-tinguishes it from those just mentioned, or from and others referredto Retzia. These features have been illustrated in the Twelfth Report onthe State Cabinet, and in the third volume of the Palaeontology of New-York. The following illustrations are repeated here, for comparison with thosealready given.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
