1849.] moore on tertiary beds in san domingo. 51 



Pleurotoma Jaquensis. 



Testa fusiformi-turrita, anfractibus 7 ad 8, transversim costatis, postice sublsevi- 

 bus, diitice spiraliter striatis ; costis validis, rotundatis, striis distinctis supra 

 costas decurrentibus ; apertura ovata, canali breviusculo, lato, extus striate, 

 subrecurvo ; sutura costella spirali, undulata induta. 



Aperture and canal about two-fifths the length of the shell. This 

 species is nearly related to PI. oblong a. 



Cerithium uniseriale. 



Testa acuminato-turrita, antice ventricosa, anfractibus spiraliter striatis, serie 

 unica tuberculorum ornatis, sutura distincta adpressa, obsolete crenata, ultimi 

 anfractus serie tuberculorum minimorum, sutura serie tuberculorum parvorum 

 ornata ; striis spiralibus tenuissirais interruptis. 



Cerithium plebeium. 



Testa acuminato-turrita, nonnunquam varicosa, anfractibus undecim rectiusculis, 

 spiraliter costatis, costis granosis triseriatis, serie postica paululum remota; 

 linea elevata suturae distincta. 



Solarium quadriseriatum. Pl. X. fig. 8, «, 5, c. 



Testa orbicularis, depresso-conoidea, anfractibus senis, superne spiraliter granosis, 

 granis in seriebus quatuor confertis ; prope marginem sulco valido postico, mar- 

 gine superne infraque minutissime crenulato, infra cingulis plurimis granosis, 

 quorum primus filiformis, minutissime crenulatus, secundus minutissimus, cse- 

 teris majoribus ; dentibus umbilici crassis. 



In the teeth of the umbilicus this species closely resembles S. gra- 

 nulatum, Lam.; in all other characters it differs from every known 

 species. 



Petaloconchus* Domingensis. Pl. X. fig. 9. 



Testa contorta, crassa, tubulo plerumque spirali, anfractibus ad marginem inferio- 

 rem angulatis, angulo costulisque longitudinalibus graniferis ; costulis nonnullis 

 etiam infra angulum anfractuum graniferis. 



This remarkable spiral shell approaches near to P. sculjpturatus of 

 H. C. Lea, only his species does not appear from his figure to have 

 any granular longitudinal ridges below the angle of the volutions. 



Natica subclausa. 



Testa obovata, laevis, anfractibus tribus, ultimo maximo, callo umbilicali magno, 

 crasso, urabilicum fere claudente. 



In general form this species nearly approaches to N. Mamilla ; in 

 that species, however, the umbilicus is entirely closed. In another 

 somewhat similar species, which I believe is called iY. Olla by Valen- 

 ciennes, the umbilicus is much more open than it is in our fossil. 



Bulla granosa. Pl. X. fig. 10. 



Testa ovato-subglobosa, ventricosa, tenuis, transversim striata, striis paucis, di- 

 stinctis, lineas incrementi decussatis, graniferis ; columella late marginata, sulco 

 postico profundo ; spira inclusa. 



Nearly like B. hydatis in form. 



* Petaloconchus of H. C. Lea, in Trans, of Amer. Phil. Soc. vol. ix. p. 229. pl. 34. f. 3. 



E 2 



