1849.] MOORE ON TERTIARY BEDS IN SAN DOMINGO. 47 



santibus ; sutura valida ; margine interno labii externi dentibus elongatis 7 ad 8 

 labio columellari intus ruguloso ; canali brevi, leviter reflexa. 



This very elegant Columbella differs entirely from any other known 

 species. 



Terebra sulcifera. 



Testa aculeiformis, anfractibus plurimis, oblique transversim sulcatis, prope sutu- 

 rara incrassatis, sulcis spiralibus duobus prope suturam admotis, tertio antico 

 subobsoleto ad basin anfractus remoto. 



Terebra in^qualis. 



Testa turrito-subulata, subcylindracea, anfractibus planulatis, longitrorsum plicato- 

 costellatis, postice linea impressa cinctis, costellis posticis obliquis, anticis ar- 

 cuatis ; anfractu ultimo antice subangulato ; columella antice biplicata. 



The deep impressed spiral line divides the volutions into unequal 

 parts. 



Terebra bipartita. 



Testa turrito-subulata, acuminata, anfractibus planulatis, longitrorsum plicato- 

 costellatis, postice linea impressa costellis decussata cinctis, costellis posticis 

 subevanidis, anticis subarcuatis ; anfractu ultimo antice rotundato, columella 

 antice laevi. 



This species somewhat resembles T. duplicata, particularly in its 

 general shape. 



Cassis sulcifera. Pl. X. fig. 1. 



Testa ovato-trigona, crassiuscula, anfractibus senis, longitudinaliter sulcatis, ulti- 

 mo seriebus duabus ad tribus tuberculorum ornato, serie postica eminentiore ; 

 apertura lata ; margine interno labii externi dentato, dentibus paucis distanti- 

 bus ; labio interno transverse costellifero ; costellis anticis prominentioribus. 



Cassidaria l^vigata. Pl. X. fig. 2. 



Testa ovata, utrinque subacuminata, plerumque laevis, nonnunquam transversim 

 striata, anfractibus senis, varicibus tenuibus nonnullis ornatis ; apertura ob- 

 longa, postice acuminata, margine interno labii externi dentato, dentibus elon- 

 gatis pliciformibus ; labio columellari antice posticeque ruguloso. 



Variat testa majori, ventricosiori. 



Oniscia Domingensis. Pl. X. fig. 3. 



Testa ovato-oblonga, subventricosa, crassiuscula, anfractibus senis, coronatis, de- 

 cussatira costatis, postice subplanulatis ; apertura elongata, postice acuminata, 

 margine interno labii externi transversim costellifero, costellis sub-bifariam co- 

 ordinatis ; labio columellari granuloso. 



When young the granules of the columellar lip are indistinct, and 

 do not extend so as to cover the lip, but when full-grown the colu- 

 mellar lip is entirely covered with granules ; in which character it 

 differs from O. cancellata. It is also distinguished from that spe- 

 cies by the nature of the denticulations on the inside of the outer lip, 

 which in O. Domingensis are extended across the lip. It is worthy 

 of remark, that O. cancellata is a Chinese species. 



