8 Bulletin 3 (90) 



ly upwards at the point where the tooth approaches it. In t3'pical 

 gibbesi these two teeth are nearl}^ equal and the lower border of 

 the hinge plate is either straight or decurving where these teeth 

 impinge upon it. That these varieties are not of specific importance 

 becomes evident upon comparing specimens of Miocene, Pliocene, 

 and recent age. 



Range in depth. — From 2,158 to 2,920 feet. 



ERIPYHLA. 

 Eriphyla galvestonerisis, n. sp. PI. i, fig's 2, a, b. 



Syn. Eriphylas^. Har. , 4th Ann. Rep. Geol. Surv. , p. 121. 



Specific characterization. — Form as indicated by the figures ; 

 hinge as in E. lumilata ; exterior smooth, slightly undulating 

 concentrically near the beaks ; beaks, as in many species of As- 

 tarte and Crassatella, slightly flattened at the very apex but very 

 gibbous just below. 



Eriphyla huitdata is an exceedingly variable shell and is abund- 

 ant in recent, Pliocene, and Miocene deposits on the Atlantic 

 slope of the United States, but none in all the collection of the 

 U. S. National Museum seem to correspond entirely' in shape and 

 much less in surface markings with this form. 



Range in depth. — From 300 to 2,600 feet. 



LUCINA. 



Lucina cremdata. 



Sjm. L. cremdata Q,ou., Foss, Sh. Med. Tert., 1840, p. 39, 

 pi. 20, fig. 2. 

 L. crenulata Flarris, 4th Ann. Rep. Geol. Surv., p. 121. 



Range in depth. — From 2,410 to 2,871 feet. 



Lucina dentata. 



Syn. L. dentata Wood., Gen. Conch., p. 195, pi. 46, fig. 7, 

 1817. 

 L. dentata Harris, 4th Ann. &c., p. 121. 

 Range in depth . — From 2,387 to 2,871 feet . 

 E ucina floridana . 



Syn. L.fiorida?ia Con., Am. Jr. Sci., 1833, vol. 23, p. 344. 

 L. floridana Har., 4th Ann. &c., p. 121. 



Range in depth. — From 2,236 to 2,871 feet. 



