. Annals of the Lyceum of Natural History of New-York. Science. 234 Notes on Species of Corliculadoe. The shell is orbicular, trigonal, compressed, inequilateral, and light. The anterior side is rounded. The superior mar- gin is convex and the inferior is curved. The beaks are small, depressed, oblique, and approximate. The valves are delicate, the color of the interior is white. The epi- dermis is green and polished. The striae are more or less ob- solete. The hinge is narrow and slight. This species is very closely- allied to Cyrena nittda, from the same locality, of which it is very possibl
. Annals of the Lyceum of Natural History of New-York. Science. 234 Notes on Species of Corliculadoe. The shell is orbicular, trigonal, compressed, inequilateral, and light. The anterior side is rounded. The superior mar- gin is convex and the inferior is curved. The beaks are small, depressed, oblique, and approximate. The valves are delicate, the color of the interior is white. The epi- dermis is green and polished. The striae are more or less ob- solete. The hinge is narrow and slight. This species is very closely- allied to Cyrena nittda, from the same locality, of which it is very possible it may be the young ; it differs in being smaller, more compressed, and gene- rally more Cyrena laevis. 9. Cyrena triangularis, Metcalfe. Cyrena triangularis, Metcalfe. Proe. Zool. xix. 74. 1851. Biv. Brit. Mus. 242. 1854. C. testa orbiculato-trigona, solida, compressiuscula, subaequilaterali; margine anteriore rotundato, posteriore subobtuso, superiore angulato, inferiore arcuato; umbonibus brevibus, approximatis; valvis crassis, intus candidis; striis irregularibus, epidermide fuscovirescente vestita ; cardine lato, anguloso. Long. 80; lat. 74; diam. 44 mill. Sab.—Borneo. Collect. Metcalfe et Prime. The shell is orbicular-trigonal, solid, somewhat compressed, and subequilateral. The anterior margin is rounded, the pos- terior somewhat obtuse, the superior angular, and the inferior rounded. The beaks are small and approximate. The valves. 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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