. Annals of the Lyceum of Natural History of New-York. Science. 90 Notes on Species of Corhiculadce. The ligament is I0112: and narrow and somewhat concealed. The strire are coarse and indistinct. The epidermis is brownish green, without polish. The interior is wrhite. The hinge is somewhat curved, not very broad, but strong. The cardinal teeth are narrow and divergent, the two principal teeth are bifurcated. The lateral teeth are short and obtuse. This species is somewhat allied to Gyrena Cyprinoides, it is however more transverse, less trigonal, and the beaks are less inflated. Compared with
. Annals of the Lyceum of Natural History of New-York. Science. 90 Notes on Species of Corhiculadce. The ligament is I0112: and narrow and somewhat concealed. The strire are coarse and indistinct. The epidermis is brownish green, without polish. The interior is wrhite. The hinge is somewhat curved, not very broad, but strong. The cardinal teeth are narrow and divergent, the two principal teeth are bifurcated. The lateral teeth are short and obtuse. This species is somewhat allied to Gyrena Cyprinoides, it is however more transverse, less trigonal, and the beaks are less inflated. Compared with Gyrena similis, it is less heavy, more orbicular, and somewhat more inflated. 6. Cyrena regula&*is, Prime. Cyrena regularis, Prime. Acad. N. S. Phil. Proc. 136. 1861. Prime Cat. 6. 1863. C. testa transversa, ovato-rotundata, valde inequilateral)', in medio Fig. Cyrena regularis. subinflata; latere antico, producto, angusto, rotundato, postico subtrun. 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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