42 BULIMULUS-ANTILLEAN. 



Plantation 'La Grange' near Frederiksted,St. Croix, a pleistocene 

 fossil. 



Bulimus riisei PFR., Malak. Bl. ii, 1856, p. 103, pi. 4, f. 7, 8. 



The large umbilicus, greatly developed columellar lip and rather 

 slender spire render this a peculiarly distinct species. The series of 

 32 examples before me show great variability in comparative length 

 of spire and in the place of insertion of the inner lip, which is some- 

 times carried up near to the posterior angle of the aperture. 



B. LEHMANNI (Pfeiffer). PL 9, figs. 40, 41, 42, 43. 



Shell perforate, ovate-conic, solid, opaque white, more or less flesh- 

 tinted. Surface slightly shining, irregularly and in general coarsely 

 and conspicuously plicate longitudinally, showing under a strong lens 

 faint, close spiral stria?. Spire conic, the apex obtuse, the nepionic 

 whorls densely, minutely wave-wrinkled, the pattern more or less 

 irregular and interrupted. Whorls 6*, moderately convex. 



Aperture ovate, slightly oblique, white inside, less than half the 

 length of shell ; outer lip unexpanded, acute ; columellar lip dilated 

 and reflexed. 



Alt. 19, diam. 9'3 mill. ; alt. of aperture 9 mill. 



Alt. 15, diam. 8'3 mill. ; alt. of aperture 7'5 mill. 



Alt. 18, diam. 8 mill. ; alt. of aperture 7*8 mill. 



Island of Anguilla (Swift, Rijersma) ; St. Martin, at Simson Bay 

 (Maze). 



Bulimus lehmanni PFR., Malak. BL, xii, 1865, p. 123; Novit. 

 Conch., p. 281, pi. 69, f. 7, 8 ; Monogr. vi, 1 1 6. Bulimulus lekmanni 

 Pfr., MAZE, Journ. de Conch., 1890, p. 25. 



Distinct in its solid, opaque texture and coarse, more or less pli- 

 cate surface sculpture. It varies somewhat in length of the spire, 

 considerably in the prominence of the folds, and also in the size of 

 the umbilicus. In the series of 51 Anguilla specimens before me, the 

 umbilicus is almost closed in some examples, while others have it 

 quite wide. 



B. LIMNOIDES (Ferussac). PL 9, figs. 59, 60. 



Shell ovate-oblong, conoid, thin, pellucid, corneous, brown, 

 smooth ; spire acute ; whorls a little convex, the last shorter than 

 the spire, perforate at base ; aperture ovate ; lips thin, acute. 



Shell medium sized, oval-oblong, swollen toward the base, the 

 spire conic and pointed at the summit ; whorls 7, flattened, sepa- 



