1 896.] NATURAL SCIENCES OF PHILADELPHIA. 335 



forming a stumpy (often very short) cone. Rusty brown. Surface 

 regularly costellate; apical whorl smooth, next whorl finely and 

 regularly striated. Last whorl ascending as usual in front, having 

 a very short umbilical rimation below. 



Aperture brownish within, rounded, obliquely truncate above. 

 Peristome white, blunt, slightly expanded; parietal callus thin. 

 Axial fold inconspicuous ; parietal tooth deep within and extremely 

 small. 



Alt. 10, diam. 6J ; alt. of aperture 4 mm. 



Alt. 12, diam. 7 ; alt. of aperture 5 mm. 



Alt. 15f, diam. 7^ ; alt. of aperture 6 mm. 



Alt. 14f, diam. 6^ ; alt. of aperture 5 mm. 



Gibara, Cuba. 



The short, typical form of this variety is extremely peculiar in 

 shape, being shorter than any other Cerion. Longer examples are 

 more like C. tenuilahre, of which we consider it a small variety. 

 Many specimens are before us. 



Cerion multistriatum Pilsbry & Yanatta. PI. XI, fig. 8. 



Shell small and rather thin, short cylindrical ; white, longitudin- 

 ally marbled with gray or chestnut-brown. Whorls 8 to 82, the 

 latter 2 or 3 about equal in diameter, the rest rapidly tapering, apex 

 obtuse. Sculptured with excessively fine, close, sharp thread-like 

 stride, apical 2 whorls smooth. Aperture rounded obliquely, trun- 

 cate ; peristome narrowly- reflexed ; parietal callys very thin ; axial 

 fold median, moderate ; parietal tooth extremely small. 



Alt. 17, diam. 7 ; alt. of aperture 6? mm, 



Alt. 14, diam. 7 ; alt. of aperture 5 mm. 



Crooked Island, Bahamas. 



This is a small, extremely fine striated form with very small 

 parietal tooth. It is represented in the collection of the Academy 

 by only five specimens, given by Mr. H. D. Van Nostrand, and 

 originally from Bland. 



Cerion basistriatum Pilsbry & Vanatta. PI. XI, fig. 28. 



Shell rather thin, cylindrical, the latter three whorls of about 

 equal diameter, those above tapering rapidly, forming a straight- 

 sided cone about one-third the shell's length. Surface rather smooth 

 and glossy. Two corneous nepionic whorls smooth ; succeeding one 

 or two turns densely and regularly striated ; rest of the shell smooth 

 except for slight irregular growth-wrinkles, down to the last whorl. 



