48 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 16, 



Strombus AMBIGUUS. 



Testa ovato-elongata, postice acuminata, transversim dense striata, anfractibus 

 octo, primis transversim costellatis, anticis duobus tubereuliferis, tuberculis 

 parvis, rotundatis ; apertura latiuscula, labio externo extus varice distincta, in- 

 tus ruguloso, labio columellari intus postice niguloso. 



Distinguished from Str. hifrons by the rugulosities at the poste- 

 rior inner part of the columellar Hp, as well as by the form of the 

 tubercles. 



Strombus Haitensis. Pl. IX. fig. 7. 



Testa suboblongo-turbinata, transversim sulcata, spira pyramidali, acuminata, 

 subundulata, varicosa, anfractibus novem, ultimo ad dorsum tuberculato, tuber- 

 culorum seriebus duabus, altera postica, tuberculis subdepresso-acuminatis ; 

 altera antica, tuberculis duobus vel tribus sistente ; tuberculo parvo prope la- 

 bium remoto ; apertura elongata, labii externi crassi margine inflexo. 



A species which closely resembles ^tr, inermis of Swaiuson, from 

 which it may be distinguished by its peculiarly-arranged tubercles. 



Strombus proximus. Pl. IX. fig. 8. 



Testa ovato-oblonga, antice posticeque acuminata, transverse striata, anfractibus 

 novem, posticis transversim costellatis, varicosis, anticis duabus tubereuliferis, 

 tuberculis acuminatis, ultimo nonnunquam seriebus tuberculorum duabus ; aper- 

 tura latiuscula, subexpansa, intus laevissima, canali subreflexo. 



This differs from Str. gracilior. Sow. (to which species it is most 

 nearly allied), in having the inner part of both lips quite smooth, the 

 outer surface of the two last volutions distinctly striated, and in the 

 first volutions being transversely ribbed and not tuberculated. 



Strombus bifrons. Pl. IX. fig. 9. 



Testa ovato-oblonga, utrinque acuminata, transversim striata, anfractibus octo, 

 primis transversim costellatis, anticis duobus postice tuberculatis, serie tuber- 

 culorum unica, tuberculis acuminatis ; apertura latiuscula ; labio externo extus 

 varice unica subdistincta intus ruguloso, labio columellari laevissimo. 



This species bears some resemblance to Str. Columha, but is very 

 easily distinguished. 



Triton simillimus. 



Testa ovato-elongata, postice acuminata, distorta, varicibus quatuor ad quinque 

 indistinctis, anfractibus octo, liris elevatis clathratis, tubereuliferis ornatis; 

 columella profundiuscule excavata, ad laterem canalis dentibus rugosa, cailosi- 

 tate postice armata ; labro subplano, margine intemo dentato, dentibus validis, 

 tertio maximo ; margine labri externo dentibus mediocribus, continuis ; canali 

 subreflexo ; anfractus ultimi parte postica interna dentibus duobus oblongis, 

 magnis. 



Nearly related to Tr. decipiens of Reeve, but distinguishable by 

 the greater coarseness of the decussating ridges and the tubercles 

 formed at their junction. 



Typhis alatus. Pl. X. fig. 4. 

 Testa ovato-oblonga, subfusiformis, transversim striata, anfractibus senis, quadri- 



