CERION, GROUP IV. 201 



speckled with cream-white, most of the striae of that tint. Whorls 

 9| to 10, nearly flat, the first 1^ smooth, convex, the rest closely 

 and evenly rib-striate, the riblets rounded and about as wide as their 

 intervals; last whorl ascending in front. Aperture truncate-ovate, 

 pale within ; the parietal lamella small, rather short, axial lamella 

 inconspicuous from in front, extending deeply inward. Peristome 

 brownish-white, blunt, a little expanded ; parietal callus a straight, 

 more or less raised ledge. 



Length 20, diam. 9 to 10 mill. 



Length 18^-21, diam. 9 mill. 



Cuba: Barigua, near Mata, on the N. shore near the eastern end 

 of the is'land (Gundlach, Arango). 



Pupa tenuilabris Gundl. in litt., PFR., Malak. Bl., xvii, p. 91 

 (1870); Monogr. viii, p. 356. 



A rather short, thick-set, dingy species, with strictly conic or even 

 slightly concave terminal cone and fine, even rib-striation. The de- 

 scription and figure are from specimens from the type locality. 



Subsp. PYGM.EUM Pilsbry and Vanatta. PL 32, figs. 27, 28, 29. 



Shell small and rather thin, varying from cylindric to short oval 

 or suborbicular. Whorls 7 to 8^, the latter 2 to 3 of sub-equal diam- 

 eter, those above forming a stumpy (often very short) cone. Rusty 

 brown. Surface regularly and finely rib-striate; apical whorl 

 smooth, next whorl finely and regularly striated. Last whorl ascend- 

 ing in front, having a very short umbilical rima below. Aperture 

 brownish within, rounded, obliquely truncate above. Peristome 

 white, blunt, slightly expanded ; parietal callus thin. Axial fold in- 

 conspicuous ; parietal tooth deep within and extremely small. 



Length 10, diam. 6g ; long axis of aperture 5 mill. 



Length 12, diam. 7 ; long axis of aperture 5 mill. 



Length 14-|, diam. 6^; long axis of aperture 5^ mill. 



Cuba : Gibara. 



Cerion tenuilabre pygmceum P. and V., Proc. A. N. S., Phila., 

 1896, pp. 325, 335, pi. 11, f. 9. Pupa cyclostoma SOWERBY, Conch. 

 Icon., xx, pi. 19, f. 179. 



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

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

 more like C. tenuilabre, which differs in having the aperture less 

 rounded, the spire different in shape, the parietal callus less defined, 



