478 PROCEEDINGS OF THE ACADEMY OF [1898. 



Aperture vertical, with a very small, short parietal tooth, and 

 moderate axial fold ; peristome blunt, expanded, subreflexed, the 

 terminations distant, connected by a moderate parietal callus. 



Alt. 20^, diam. 82, length of aperture 7s nun. 



Alt. 20, diam. 9j, length of aperture 8 mm. 



Cayo Juin, Baracoa, Cuba (Prof, de la Torre, F. E. Blanes). 



There is a small form, alt. 13, diam. 6i, length of aperture 5 mm., 

 having all the characters of the larger except that there are only 8 

 whorls. 



The last whorl in this species is half the total length of the shell 

 or a trifle more, and upon it the ribs are weak or wholly obsolete. 

 Compared with C. incrassatum microdon, it differs in the concave 

 instead of convex outlines of the terminal cone, and the color. It 

 differs from C. tenuilabre in the coarser sculpture ; and from both 

 in the comparatively smooth last whorl. 



Cerion sanzi Blanes. Fig. 9. 



Shell rimate, solid and strong, cylindric-conic. White, very 

 sparsely and inconspicuously mottled with grayish or brown ; luster- 

 less, the ribs rather glossy. Lower three whorls of about equal 

 diameter, those above forming a rather long cone terminating in an 

 obtuse apex. Whorls 10—11 J, the first smooth, the rest ribbed ; ribs 

 rather strong, narrow, separated by far wider interstices, 20-27 on 

 the penultimate whorl, frequently in part obsolete on the last whorl, 

 split on the base into an irregular striatiou. Aperture irregularly 

 oval, the throat brown ; peristome reflexed, more or less thickened, 

 the terminations joined by a heavy parietal callus. Parietal tooth 

 deep within, strong and rather long; columellar tooth well marked. 



Alt. 27, diam. 11 i, length of aperture 10 mm. 



Alt. 23?, diam. 10s, length of aperture 9 mm. 



Confites Key, Nuevitas, Cuba. 



This species has considerable resemblance to C. mum-ia, but differs 

 conspicuously in the strong development of the parietal fold, the 

 inner termination of which is not visible from the aperture. In 

 some specimens the interior of the aperture is mainly white, the 

 brown appearing far within. In one shell of the type lot there is a 

 small accessory denticle to the left of the main fold. 



