BULIMULUS-ANTILLEAN. 41 



earlier whorls denuded of cuticle and purplish-brown ; scarcely shin- 

 ing ; striation irregular and rather sharp, more or less cut into spiral 

 puckered zones by spaced spirals which cut merely the strise ; spire 

 somewhat convexly conic, apex obtuse, criss-cross granulate, gener- 

 ally eroded. Whorls 6i, slightly convex, the last convex. 



Aperture squarish-ovate, slightly oblique, flesh-colored inside, less 

 than half the shell's length ; peristome considerably thickened with- 

 in, bevelled, the outer lip more strongly curved and slightly sinuous 

 toward the upper insertion ; columella subvertical, nearly straight 

 or slightly convex ; the columellar margin reflexed and dilated, 

 forming an angle with body of shell ; parietal callus thin and trans- 

 lucent. 



Alt. 30, diam. 14 mill. ; alt. of aperture 13 mill. 



Alt. 27, diam. 15 mill.; alt. of aperture 12 mill. 



Dominica (Brown, Angas, Ramage, Sharp). 



Bulimus nicholsii A. D. BROWN, American Naturalist, xv, p. 57, 

 Jan., 1881 (no description). Bulimus nichollsi A. D. Brown mss., 

 ANGAS, P. Z. S., 1883, p. 596, p. 595, f. 2, 3.~ Bulimus (Thaum- 

 astus) nichollsi Brown, SMITH, Ann. Mag. N. H. (6), ii, p. 231. 



This species is allied to B. exilis, but conspicuously different in 

 the greater size, stronger cuticle, puckered stride and color. The 

 squarish form of the aperture and thickened lip are very similar to 

 many Guadelupe specimens of exilis. Brown found it plentiful on 

 the road from Roseau to Rosalie, 2000 ft. alt. It is said by Angas 

 to be arboreal. 



B. RIISEI (Pfeiffer). PI. 14, figs. 1, 2 ; pi. 9, figs. 38, 39. 



Shell broadly and deeply umbilicated, rather solid, ovate-conic, 

 (white in its fossil condition) ; surface with low, irregular growth- 

 wrinkles. Spire elevated, slender, pointed-conic, the apex slightly 

 obtuse, nepionic whorls pit-reticulate. Whorls 6| to over 7, moder- 

 ately convex. 



Aperture long-ovate, well rounded outwardly, flatter on the body 

 side, varying from somewhat over to considerably less than half the 

 total length of shell; peristome thin, slightly expanded, the ends 

 converging ; columellar lip produced forward nearly to the ventral 

 level of body-whorl, broadly revolute, arching over the capacious 

 umbilicus. 



Alt. 35, diam. 16 mill.; alt. of aperture 16 mill. 



Alt. 27i, diam. 15 mill. ; alt. of aperture 15 mill. 



Alt. 22 1, diam. 13 mill. ; alt. of aperture 11* mill. 



