. Annals of the Lyceum of Natural History of New-York. Science. 88 Notes on Sjpecies of Corbiculadce. The shell is transverse, subtrigonal, inequilateral, and some- what inflated. The anterior side is produced and the posterior Fig. Cyrena ponderosa. side is somewhat truncated. The valves are very ponderous. The interior is white. The beaks are small and oblique, they are often very much eroded. The striae are close, coarse, and indis- tinct. The epidermis is dusky brown without polish. The hinge is angular, broad and strong. The cardinal teeth are somewhat flattened and nearly parallel.
. Annals of the Lyceum of Natural History of New-York. Science. 88 Notes on Sjpecies of Corbiculadce. The shell is transverse, subtrigonal, inequilateral, and some- what inflated. The anterior side is produced and the posterior Fig. Cyrena ponderosa. side is somewhat truncated. The valves are very ponderous. The interior is white. The beaks are small and oblique, they are often very much eroded. The striae are close, coarse, and indis- tinct. The epidermis is dusky brown without polish. The hinge is angular, broad and strong. The cardinal teeth are somewhat flattened and nearly parallel. The lateral teeth are not much raised, the anterior tooth is short and conical, the posterior is a little longer and not quite so much raised. This species is somewhat allied to Cyrena Bengalica, it is however smaller, a little more transverse, and the beaks are much less raised and less inflated. 5. Cyrena Cyprinseforniis, Prime. Cyrena Cyprinceformis, Prime. Acad. N. S. Phil. Proc. 125. 1861. Prime Cat. 6. 1863. C. testa magna, transversa, ovato-subtrigona, suborbiculari, inaequi- laterali, in medio ventricosa, solida, crassa ; latere antico breviore, rotnn- dato, postico angustiore, snbtruncato; pagina interna candidissima;. 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 Lyceum of Natural History (New York, N. Y. ). New-York :
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