362 DESCRIPTIONS OF NEW SPECIES OF FOSSILS 



C. TRISERTALE, Gabb, D. s., PI. 46, fig. 53. 



Shell minute, spire elevated, whorls increasing gradually in size, nine in num- 

 ber, of which three are nuclear; the others slightly convex and sloping on the 

 sides, and most prominent below, curving in rather rapidly to the suture, which is 

 contained between two plain thread-like ribs. The rest of the surface is cancel- 

 lated by a series of three revolving ribs, crossing a series of longitudinal ones of 

 equal size, and producing an appearance of tuberculation at each point of intersec- 

 tion. Aperture broad, elongated, outer lip simple; inner lip lightly encrusted; 

 columella slightly bent, produced, but bearing no folds. Length 3 mm. 



Sufficiently like C. Limonensis to render a little care necessary in distinguishing 

 such minute objects. This is a much broader and more robust shell, has but nine 

 volutions, while that has twelve ; this has three whorls in the nucleus, that has 

 four ; the suture of this is distinctly pointed out by the plain ribs that border it, 

 while in that the suture is lost sight of in the strong cancellation of the surface. 

 In this the mouth is much larger and the canal more produced than in that, 



C. CoLLiNSii, Gabb, n. s., PI. 46, fig. 54. 



Shell small, elongated, spire high, apical angle rather broad; whorls nine, two 

 of which form the smooth nucleus ; the other seven convex on the side, and orna- 

 mented by fine, thread-like, revolving, and longitudinal ribs which cross each other 

 without tubercles, or other increase in size, forming a regular fenestration. Of 

 the revolving ribs there are three on the body whorl, but only two on the upper 

 volutions. Base of body whorl plain or carrying a single thread-like rib. Aper- 

 ture broad; outer lip simple; inner lip faintly encrusted; columella small, faintly 

 twisted, and without a fold. 



Length 5 mm. 



Named after Mr, Collins, my topographical assistant. 



C. LoRDLYi, Gabb, n. s., PI. 46, fig. 55. 



Shell minute, subulate, whorls seven, barely an entire one at the apex being 

 smooth; lower 'whorls slightly convex ; suture well marked; surface ornamented 

 by about ten or a dozen longitudinal ribs, crossed by three smaller revolving ribs. 

 On the body Avhorl there is a fourth of these ribs, besides another heavy plain rib, 

 which borders the plain base of the whorl. This last rib winds into the aperture 

 so as to produce the false appearance of a posterior tooth on the pillar lip. Oc- 

 casionally one of the longitudinal ribs increases so in size as to develop almost 

 into a varix for a single volution. Mouth subquadrate; inner lip slightly encrusted 

 and reflected; columella straight, slightly everted, but without fold. 



Length 3 mm. 



