BULIMULUS-BOSTRYX-PERON^EUS. 149 



dots, scattered at random, as in B. andoicus. It differs from andoicus 

 in the contraction of the umbilical cavity, the form of the aperture, 

 which is less elongated, and by the quite considerable separation of 

 the ends of the peristome. 



B. LESUEUREANUS Morelet. PI. 46, fig. 45. 



Shell rimate-perforate, turrited ; a little shining, opaque, whitish, 

 unicolored or banded with ashen. Apex acute and pale corneous. 

 Whorls 7, little convex, the uppermost smooth, the rest costulate- 

 striate ; last whorl usually somewhat rugose, shortly attenuated at 

 base, rounded, compressed around the rimation, not attaining one- 

 third the length of shell. 



Aperture subvertical, oblong, pale fulvous within ; peristome 

 simple, acute, unexpanded, the columellar margin narrowly dilated 

 and reflexed. Alt. 22, diam. 7 mill. (Morel}. 



Pomacocha and Cocharcas, Andean Plateau, Peru (Angrand). 



B. lesueureanm MOREL., Journ. Conch., viii, 1860, p. 374; Ser. 

 Conch., iii, p. 200, pi. 9, f. 4. PFR., Monogr., vi, p. 137. 



This Bulimus is white with a perceptible tint of fawn at the 

 base, and some sparse vestiges of punctation. Certain individuals 

 are unicolored, others ornamented with gray bands which are more 

 or less numerous, sometimes confluent, and visible within the aper- 

 ture. The earliest whorls of the spire are smooth and corneous ; the 

 rest sculptured with small, low, sinuous and close riblets, progres- 

 sively enlarging and then becoming unequal and confused ; the last 

 sometimes with cracks and irregular rugosities. It is narrower than 

 B. albicolor. This species lives at Pomacocha and Cocharcas, tem- 

 perate vallies of the plateau of the Cordillera, where the culture of 

 wheat reaches its extreme limit. 



B. HAMILTONI Keeve. PL 46, fig. 51. 



Shell umbilicate, turrited; rather solid, rudely plicate-striate ; 

 opaque, white; spire elongated, slender, the apex red. Whorls 8, 

 convex, the last not attaining one-third the length, somewhat com- 

 pressed around the narrow umbilicus. Columella receding. Aperture 

 little oblique, oval ; peristome simple, unexpanded, the margins ap- 

 proaching, columellar margin widely reflexed above. Alt. 18, diam. 

 6 mill. ; aperture 5? mill, long, 3 wide. (JfV). 



Mountains near Lake Titicaca, Bolivia, 14000 ft. alt. (Pentland). 



