292 MR. E. A. SMITH ON THE [Apr. 1, 



Triforis atlantica. (Plate XXI. fig. 26.) 



Testa liavd jyerelongata, aJha, livido-fusco inferne zonata ; anfvac- 

 tus 13, anguste turriti, suprcini minute cancellaii, cateri plmii, 

 granulorum seriebus (hiobus vel tribus cincti, ultimus seriebus 

 quinque, infimn mhnts tuhcmdatfi. ornntus ; cauda brevis, 

 carina valida instructa, fiiscescens ; apertura obliqua, ovnta, 

 superne canaliculata ; peristoma siipeme leviter incisum, inferne 

 columella callo crasso jnnctvm. 

 Lonr/it. G rnillim., diam. 2. 



The outlines of this species are a little convex. Only the penul- 

 timate and antepenultimate whorls have three distinct rows of 

 granules, and of those the central one is the smallest. The granules 

 of the lowermost series, or rather the interstices between them, are 

 brown and the uppermost series is white. 



Triforis recta. (Plate XXIV. fig. 3.) 



Testa clongata, gracilis:, fnscescens, ad apicem plerumque piallidn ; 

 anfractus 13, primi duo hicarinati, cateri liris trihns, granoS'S, 

 subcequalibus, cim'ti, idtimus liris duabus simplicihus infra 

 mediara instritctus ; linea siUiiralis canalindata ; apertura 

 parva, ovalis ; labrum superne leviter simiatum ; columella callo 

 incrassato induta ; canalis brevissimiis, liaud clansus. 

 Longit. 5 millim., diam. 1\. 



This species is more slender than any of the others from 

 St. Helena, and remarkable on account of the sculpture of the apical 

 whorls, which is not fine as in T. melanura and T. perversa, but 

 consists of two strong spiral keels on each whorl. The above- 

 mentioned species also have only two series of granules on the whorls 

 towards the apex, whereas in the present species there are three. 



Triforis bathyraphe. (Plate XXIV. fig. 4.) 



Testa hand per elongata, albida vel pall ide fusca ; anfractus 11, 

 convexiuscidi, sutura profunda sepincti, liris s^nralibiis tribus 

 suba'cpialihus, Urisque longitudinalibns circiter 26 granose can- 

 cellaii ; anfr. idtivius liris sed'cinctus ; apertura rotunde ovata ; 

 labrum tenue, superne ad suturam anguste sinuatum, inferne 

 columelhe junctum ; caudabrevis, leviter recurvcf. 

 ■ Longit. 5|- millim., diam. 2. 



This species is peculiar on account of the deep suture and the 

 distinct cancellation of the surface. The whorls, too, are convex, so 

 that the central row of granules are most prominent. It is a much 

 stouter shell tban 2'. recta and has a different aperture. 



Cerithiopsis rtjgulosa (C. B. Adams). 



Cerithium rugidosum, C. B. Adams, Contributions to Conch. 

 p. 121 ; Sowerby, Tbes. Conch, pi. IS4. fig. 2:37 (237 » ?). 



Hah. Jamaica {Adams) ; St. Vincent's (Brit. Mus.) ; Algiers 

 (Sowerby)! 



