192 CERION, GROUP III. 



III. Group of C. crassilabris. 



Shell cylindric to oval, sculptured with numerous close ribs or rib- 

 striae. Parietal tooth short, at the middle of the parietal wall. The 

 species are distributed as follows : 



Guiana: C. antoni, p. 192. 



St. Croix : C. rude, p. 193. 



Porto Rico arid the Virgin Is. : C. crassilabris, p. 192. 



Haiti : C. yumaense, with varieties ferrugineum and sallei. 



Grand Cayman Island : C caymanense, p. 196, 



The forms are closely related to the Cuban group of C. cyclostoma, 

 being separated here merely on account of the different distribution. 



. ANTONII (Kiister). PI. 32, figs. 39, 40. 



Shell ovate-cylindric, umbilicate, a little shining, the spire obtuse; 

 regularly striate -and sulcate ; rose -white; whorls 9, the suture 

 simple. Aperture ovate-rounded, with two folds ; peristome sub- 

 labiate. Length 16, diam. nearly 8 mill. (Kuster). 



Berbice, British Guiana (Anton coll.). 



Pupa antonii KUESTER, Conchyl. Cab. p. 92, pi. 10, f. 7, 8. 

 PFR., Monogr. iii, p. 539. 



The shell is thin, translucent, ovate-cylindric, very blunt-pointed, 

 with a short umbilical fissure and deep but narrow umbilicus ; it is 

 rose-reddish white. The suture rises high toward the aperture. 

 Aperture white, yellow-reddish within. There is an oblique fold on 

 the parietal wall, and a second almost horizontal one on the colu- 

 mella. Peristome hardly expanded, nearly straight, a little thickened. 



The above details and the figures are from Kuster. The species 

 has not been seen, apparently, by any other author. On account of 

 its anomalous location, far out of the range of the rest of the genus, 

 it becomes of unusual interest. There is, of course, a possibility of 

 mistake about the locality. 



C. CRASSILABRIS (< Shuttlw.' Sowb.) PI. 33, figs. 47-52. 



Shell deeply rimate, oblong, solid and strong, varying in color 

 from (a) white with some fleshy maculation above, the apical whorls 

 corneous, to (b) angularly streaked and maculate throughout with 

 dull dark brown or fleshy, or (c) purplish brown with white rib- 

 striae. Form somewhat cylindric, the last two, sometimes three 

 whorls of equal diameter, the rest slowly tapering. Apex excessively 



