Bulletin of the Museum of Comparative Zoology at Harvard College . Velorita Cochinensis. and less trigonal; it is larger than Ci/prinoides, but less ponderous andloss trigonal. The hinge of my species is much narrower and less solidthan that of either Cochinensis or Cyprinoides. MUSEUM OF COMPARATIVE ZOOLOGY. 45 Batissa laevigata, Schumacher. PL 11. Fig. 5, a, b, c. Cyclas Icevigata, Schumacher. Schuin. Essai dun noiiv. syst. 170, PI. XII. Fig. 1, Childrence, Gray. Ann. Phil. 117, 1825. Venus CJiildreni, Gray. Wood, Index Test, suppl. PI. 2, Fig. 13, Childrence, Desha


Bulletin of the Museum of Comparative Zoology at Harvard College . Velorita Cochinensis. and less trigonal; it is larger than Ci/prinoides, but less ponderous andloss trigonal. The hinge of my species is much narrower and less solidthan that of either Cochinensis or Cyprinoides. MUSEUM OF COMPARATIVE ZOOLOGY. 45 Batissa laevigata, Schumacher. PL 11. Fig. 5, a, b, c. Cyclas Icevigata, Schumacher. Schuin. Essai dun noiiv. syst. 170, PI. XII. Fig. 1, Childrence, Gray. Ann. Phil. 117, 1825. Venus CJiildreni, Gray. Wood, Index Test, suppl. PI. 2, Fig. 13, Childrence, Deshayes. Brit. Mus. Cat. Conchif. 237, 1854. B. testa ovato-subrotunda, obliqua, iusequilaterali, depressiuscula,crassa, solida, postice ab umbouibus obscure subangulata, epidermidefusco-viridi nitente induta, iutus pallida violacea; latere antico breviore,obtuso, transversim infequaliter sulcato; sulcis in medio evanidis; laterepostico latiore rugis irregularibus divergentibus notato, lamina cardinidilata, crassa, dentibus primariis tribus insequalibus, in utraque


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