BULIMULUS-ANTILLEAN. 37 



aaa. Shell thin, corneous, smooth, without spiral striae, the apical 

 sculpture subobsolete; whorls well rounded ; aperture under 

 half the alt. sepulcralis. 



B. EXILIS (Gmelin). PI. 9, figs. 61, 62, 63, 64, 65, 66, 67. 



Shell very narrowly perforate, narrowly oblong, varying from 

 thin to quite solid ; various in color, being (typical) soiled white or 

 yellowish with three dark brown bands, the upper and lower wide, 

 suture white margined, or (form acutus Leach) with a single narrow 

 peripheral band, or (form albus Sowb.) unicolored yellowish or 

 whitish, or (form obscurus') brown or purple-brown, unicolored 

 except for a light sutural line. Surface lusterless, almost smooth, 

 the growth-lines faintly indicated, and some specimens showing fine 

 and faint spiral striation. Spire high-conic with slightly convex 

 outlines, the apex obtuse, earlier If whorls densely and finely zigzag 

 striolate; whorls about 65, a trifle convex, the last a little deflexed 

 in front. Aperture varying from nearly half to less than a third 

 the total alt. of shell, somewhat oblique, ovate ; white, purple-brown 

 or banded within ; peristome more strongly arcuate above, slightly 

 or very heavily calloused within ; columella nearly straight, its edge 

 well reflexed ; parietal callus generally slight. 



Alt. 20, diam. 9 mill. ; alt. of aperture 9 mill. 



Alt. 27, diam. 11 mill. ; alt. of aperture 11'2 mill. 



Alt. 23'5, diam. 8'5 mill. ; alt. of aperture 8'6 mill. 



Caribbees, from Barbados and Martinique to the Virgin /., and 

 west to Haiti. Barbados (Parkinson, Feilden, Kush) ; Martinique 

 (Maze) ; Dominica (Guppy, A. D. Brown, Ramage, Angas, Sharp, 

 Verrill) ; Guadelupe (Cochrane, de Badier, Maze, Sharp, Beau), 

 with Grande Terre (Sharp), Saintes, Desirade and Marie Galante 

 (Maze) ; Montserrat (Rawson) ; Antigua (Hamilton) ; St. Bartholo- 

 mew (Cleve) ; St. Christopher or St. Kitts (Hamilton, Rush); Bar- 

 buda (according to Pfr.) ; St. Martin (Bland, Maze) ; Tortola ; St. 

 Thomas (Bland, Salle, Schramm, ' Challenger ' Rush) ; Vieque 

 (Riise, Swift) ; Porto Rico (Swift, Krug), at Jabacoa (Sintensis) ; 

 Haiti at Cape Haitien (Rolle), Aux Cayes (Swift, Salle). 



Colonized : Jamaica at Castleton not far from the botanic gardens, 

 abundant (Roper). 



Doubtful localities : St. Vincent (Guilding, according to Pfr.) ; 

 Cayenne (Eyries). 



