260 CERION, GROUP XI. 



Typical C. GLANS (Kiister). PI. 42, figs. 48, 49, 50, 51, 52. 



" Shell rimate, ovate, rather acute, rose-white, strongly ribbed, 

 the ribs close, white. Whorls 10, a little convex, narrow, the last 

 banded below with brown. Aperture semi-ovate, glossy and pale 

 yellow within; peristome recurved, thickened, the parietal margin 

 with one fold. 



*' Shell with an arcuate umbilical chink ending in a perforation, 

 short and stumpy, broad ovate, rapidly tapering above, thin, almost 

 lusterless, rose-reddish-white, obliquely ribbed except the first two 

 whorls, the ribs strong, acute, crowded and somewhat arcuate. The 

 10 whorls are very narrow, flat-convex, appearing somewhat sepa- 

 rated by an impressed suture; the last forms more than a third of the 

 entire length, and shows towards the base a brown-reddish band sur- 

 rounding the umbilical region, its lower edge washed out. The suture 

 is irregularly crenate by the projecting ribs. Aperture obliquely 

 half-ovate, glossy and pale yellow inside ; peristome thick, lipped, 

 reflexed outwardly, the margins connected by a callus. Columella 

 short, rather straight, on the parietal wall a small fold stands, and a 

 quite indistinct one may be seen far within on the upper part of the 

 columella. Length 8^-10, width 4-5 lines" (Kuster). 



New Providence, near Nassau (J. J. White). 



Kiister's description is given above, and his figures are copied on 

 pi. 42, figs. 51, 52. The habitat of the species was unknown, but 

 from the exact agreement with description and figures of specimens 

 collected by Mr. J. J. White at Nassau, New Providence, there 

 can be no reasonable doubt that that is the type locality. These 

 shells (pi. 42, figs. 48, 49, 50) are flesh-tinted in the intervals be- 

 tween whitish riblets, which are narrower than the spaces and very 

 numerous ; the rather narrowly reflexed lip is thick ; the aperture is 

 pale brownish-yellow or ochre-tinted within. The parietal callus is 

 thick and heavy, oppressed and gradually thinner towards its outer 

 margin, not forming an elevated ridge across the parietal wall, as in 

 the ordinary " glans " of collections. Whorls 9^ to 10^. It is often 

 more elongate than Kiister's types, specimens measuring: 



Alt. 25, diam. 12 mill. ; riblets on penult, whorl 25. 



Alt. 26^, diam. 12 mill. ; riblets on penult, whorl 31. 



Alt. 29, diam. 12^ mill.; riblets on penult, whorl 35. 



Alt. 31, diam. 11^ mill. ; riblets on penult, whorl 29. 



Some specimens have coarser ribs than the majority of the lot; 



