1898.] NATURAL SCIENCES OF PHILADELPHIA. 477 



1-2 mm. apart, and decidedly narrower than the intervals; parietal 

 margin of peristome more elevated. 



Vita, Cuba. 



This looks like a distinct species, but is merely the costate form 

 of the preceding. It is more slender than the ribbed form of C 

 dimidiatum, with finer ribs, continued upon the terminal cone, and 

 there is no basal keel. 



Cerion sueyrasi Blanes. Fig. (5. 



Shell cylindrical, solid, rimate, the lower three whorls of about 

 equal diameter, those above forming a rather short, obtuse cone. 

 Whorls 10, the first smooth, next finely costulate, the rest very con- 

 vex, coarsely and sharply ribbed, the ribs high, angular, 15 to 18 in 

 number on the last whorl ; numerous rather irregular spiral striae 

 revolving about the middle of the lower two or three whorls. Color 

 (of specimens some time dead when collected), creamy or fleshy 

 white. Aperture small, with small teeth ; peristome expanded, 

 blunt, continued raised and straight across the parietal margin. 



Alt. 21, diam. 85, length of aperture 1\ mm. 



Alt. 22, diam. 9, length of aperture 8 mm. 



Vita, Cuba (Francisco E. Blanes). 



A fourth member of the group of C. scalarinum, decidedly stouter 

 in the spire than C. scalarinum Gundl. or C. johnsoni Pils. & Van., 

 and differing from C.jelis P. & V. in the weak development of the 

 teeth. 



Cerion incanum saccharimeta Blanes. Fig. 5. 



Shell much larger than typical incanum, with long, tapering spire 

 and blunt apex. Whorls 13, the last frequently irregularly costate. 

 Alt. 38, diam. 13, length of aperture 12 mm. 



Sugar Loaf Key, Florida (F. E. Blanes). 



Cerion crassiusculum Torre. Figs. 7, 8. 



Shell rimate, cylindrical, rather solid, lusterless, light brown or 

 yellowish-brown throughout. Latter three whorls of equal diameter, 

 or wider above, those above tapering in a short cone with straight 

 or slightly concave outlines; apex obtuse, rather mammillar. 

 Sculptured with rather close, regular, strong riblets, which are some- 

 what oblique, varying from as wide to half as wide as the inter- 

 stices, and about 28 in number on the antepenultimate whorl; be- 

 coming obsolete or partially so on the last whorl. Whorls nearly 

 10, but slightly convex, the last slightly ascending in front. 



