CERION, GROUP IV. 199 



expanded throughout, the margins converging, joined by a thin 

 callus ; right margin arcuate, columellar margin somewhat dilated. 

 Length 17, diam. 1\ mill. (Pfr.}. Cuba (Poey). 



Pupa cumingiana PFR., Proc. Zool. Soc., Lond., 1852, p. 68; 

 Monogr., iii, p. 539 KUESTER, Conchyl. Cab., p. 162, pi. 19, f. 

 23-25. 



Known to me by the original description and figures only. The 

 specimens reported from the Bahamas by Bland do not seem to be 

 the same. 

 Var. paredonis Pilsbry, n. v. PI. 32, figs. 21, 22. 



Shell cylindric or ovate, fleshy-white with faint maculation above, 

 or blotched throughout with brown, the ribs mainly white. Whorls 

 8J to 10, slightly convex, sculptured with stout rounded ribs a little 

 narrower than the concave intervals, and 22 to 28 in number on the 

 penultimate whorl. Aperture dark brown within and wrinkled in* 

 harmony with the external ribs; peristome white, narrowly reflexed* 

 Parietal callus very thin, the ribs showing strongly through it ; par- 

 ietal lamella low, but long, deeply entering to a dorsal position ; axial 

 lamella tooth-like. 



Length 17, diam. 6.8, longest axis of aperture 6 mill. 



Length 15, diam. 6.5, longest axis of aperture 6 mill. 



Length 18.8, diam. 7.5, longest axis of aperture 7 mill. 



Cayo Paredon Grande, off N. shore Puerto Principe, Cuba. (Ar- 

 ango.) 



The fleshy-white specimen is cylindric, with comparatively coarse 

 ribs ; the mottled shells, which 1 regard as typical of the variety, are 

 smaller, tapering, with finer ribs. The dark mouth and long parietal 

 lamella are the same in all. This form may be a tangent from the 

 C. mumia stock. 



C. MICROSTOMUM (Pfeiffer). PI. 32, figs. 30, 31. 



Shell deeply rimate, subcylindric rather solid, closely and lightly 

 ribbed ; whitish, irregularly marked with brownish-corneous streaks. 

 Spire lengthened, produced in a rather obtuse cone ; suture im- 

 pressed ; whorls 10, slightly convex, the last not quite one-third the 

 total length, slightly ascending in front, somewhat compressed and 

 sharply striate at the base. Aperture lunate-rounded, pale livid 

 within, provided with a compressed parietal tooth and an obsolete 

 columellar fold ; peristome simple, narrowly expanded, the margins 



