50 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 16, 



TURBINELLTJS VALIDUS. 



Testa oblongo-subfusiformis, laevis, postice acuminata, antice coarctata, anfractibus 

 6 ad 8, subventricosis, spiraliter striatis, posticis transversim obtuse costatis, 

 intermediis subtuberculatis, anticis duobus postice tuberculatis ; sutura canali- 

 culata, margine levata ; apertura magna, canali valido extus striato. 



This species somewliat resembles T. Scolymus : it differs, how- 

 ever, materially in its general form not being hexagonal ; in the su- 

 tm'e, whose margin is elevated and with a narrow channel ; and in 

 its tubercles, which are small and romided. 



TURBINELLUS HaITENSIS. 



Testa subtrigona, turbinata, transversim striata, tuberculata, spira subdepressa, 

 subacuminata ; anfractibus senis, postice anguliferis, ad angulum tuberculiferis, 

 lateribus declivibus ; antice seriebus duabus tuberculorum, quarum postica multo 

 major ; labio columellari quadiiplicato ; canali extus subtuberculato. 



The flatness of the spire at once distinguishes this from T. pugil- 

 laris. Lam. 



Pleurotoma Henikeri. Pl. X. fig. 6. 



Testa elongato-acuminata, crassiuscula, rudis, anfractibus novem, spiraliter liratis, 

 longitudinaliter rctundato-costatis, infra suturam unilii'atis, deinde laevibus sub- 

 concavis ; apertura oblonga, latiuscula, labio externo valido, crasso, sinu postice 

 distincto, columellari crassiusculo ; canali breviusculo, subumbilicato, subre- 

 flexo. 



In general form this species resembles Fl. maura^ Sow. ; there are, 

 however, several characters by which it may be distinguished. 



Pleurotoma venusta. Pl. X. fig. 7. 



Testa acuminato-tm-rita, crassa, anfractibus rotundatis, confertim costeUatis, in- 

 terstitiis transversim liratis, ad suturam subdepressis, labio externo crassiusculo, 

 patulo, sinu postico lato, profundo; canali brevissimo, subrecurvo; ultimi an- 

 fractus tuberculo dorsali oblongo, conspicuo. 



In shape this species resembles Fl. gihbosa of Kiener and Pl. pal- 

 lida of Sowerby. 



Pleurotoma Consors. 



Testa elongata, acuminato-turrita, anfractibus postice concavis, laevibus, mediane 

 et antice spiraliter liratis, liris costis longitudinalibus decussantibus granulis 

 formantibus ; sutura undulata, lira parva levata antica ; canali mediocri. 



This species bears some general resemblance to Pl. militaris of 

 Reeve. 



Pleurotoma Haitensis. 



Testa turrito-acuminata, elongata, spiraliter striata et lirata, liris in utroque an- 

 fractu quatuor, centrali conspicuo, in ultimo anfractu septem, tertio conspicuo 

 sinu distincto ; canali longo, oblique lirato ; interstitiis linearum incrementi ob- 

 solete decussatis. 



In general appearance this species resembles Pl. virgo : it differs, 

 however, m the circumstance that in Pl. virgo the second ridge is 

 generally the one that is decurrent with the notch, whereas in our 

 fossil it is the third ; this ridge has also a second line marking its 

 edge. 



