. Annals of the Lyceum of Natural History of New-York. Science. Two JVew Species of MoUusca of the Genus Corbioula. 481 2. Corbicula iiiediocris, nov. sp. T. ovato-transvers&., compressiuscola, subsequi- laterali, temii, latere antice subangulato, postico snbtruncato; umbonibus tumidis, brevibus, lajvi- gatis ; lunula ovato-lanceolata, pallida, laevigata ; transversim regulariter sulcata; epidermide flaves- cente-viridi, vestit^, ad umbones atro-violascente radiata ; valvis intus violaceo-rubris; cardine an- gusto inajqualiter tridentato ; dentibus lateralibus brevibus, angustis, albis, te
. Annals of the Lyceum of Natural History of New-York. Science. Two JVew Species of MoUusca of the Genus Corbioula. 481 2. Corbicula iiiediocris, nov. sp. T. ovato-transvers&., compressiuscola, subsequi- laterali, temii, latere antice subangulato, postico snbtruncato; umbonibus tumidis, brevibus, lajvi- gatis ; lunula ovato-lanceolata, pallida, laevigata ; transversim regulariter sulcata; epidermide flaves- cente-viridi, vestit^, ad umbones atro-violascente radiata ; valvis intus violaceo-rubris; cardine an- gusto inajqualiter tridentato ; dentibus lateralibus brevibus, angustis, albis, teiiue striatis. Long. 22; lat. 17; diam. 11 mill. f; ri; tV poll- Hah. f (Mj Cabinet.) This species is comparatively delicate, it is nearly equilateral; the anterior side is somewhat distended and angular, the pos- terior being abrupt, the beaks are small and not much raised, the lunula is distinct and of a lighter color than the rest of the shell; the strise, though somewhat coarse, are regular and close; the epidermis is j^ellowish-green, the valves very little convex are, in the interior, dark purplish-violet. Compared with the C. occidens, from India, to which it is closely allied, the beaks are smaller, the hinge is slighter, but the main difference consists in the fact that in the G. mediocris the anterior side is distended and angular, whereas in C. occidens it is 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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