BULIMULUS-BOSTRYX-PERON^EUS. 147 



has 6! whorls remaining. There is an umbilical rimation, and the 

 aperture is dark-streaked within, with a faint trace of a spiral light 

 median band. 



B. PELIOSTOMUS Philippi. PI. 46, figs. 40, 41. 



Shell compressed-umbilicate, oblong-turrited, solid, rather roughly 

 striate, a little shining, white. Spire long, somewhat regularly tur- 

 rited, the apex acute ; suture slight, irregularly crenulated. Whorls 

 7, the embryonic convex and glossy, the rest rather flat ; last whorl 

 about three-sevenths the shell's length, compressed and narrowed at 

 base. 



Aperture subvertical, narrowly oblong, rounded at base, black- 

 broirn inside ; peristome simple, the margins subparallel, outer mar- 

 gin very gently ascending above, the columellar margin dilated and 

 wide above, black-brown. Alt. 21, diam. 7 mill. ; aperture, alt. 9, 

 width 3* mill. (Pf>.). 



Between Jocos and the Mammon River, Peru (Raimondi) ; Pataz, 

 Peru (Paz). 



B. pelio*tomus Phil, in letter, PFR., Malak. Bl., xiv, 1867, p. 77; 

 Monogr., vi, p. 136 ; Novit. Conch., iii, p. 466, pi. 101, f. 22, 23. 

 HIDALGO, Journ. de Conch., 1875, p. 131. 



Shorter than B. ivilliamsi, urnbilicate, and white outside. 



B. ANDOICUS Morelet. PL 46, figs. 42, 43, 44. 



Shell narrowly urabilicated, rather solid, oblong-turrited, sub- 

 fusiform, obsoletely striated, little shining ; whitish, striped with nar- 

 row, pale reddish streaks, fainter on last whorl. Spire sensibly 

 attenuated, the apex rather acute. Whorls 8, slightly convex, the 

 last attenuated at base, compressed around the umbilicus, three- 

 sevenths the length of the shell. 



Aperture oblong, little dilated, subangular beneath, tawny wine- 

 color within ; peristome simple, unexpanded, the basal margin a 

 trifle expanded; margins approaching, the outer regularly arcuate, 

 columellar nearly straight, dilated and somewhat reflexed. Alt. 

 26-30, diam. 9-10 mill. (Morel). 



Variety : smaller, whitish or ashen, unicolored or irregularly 

 banded. Alt. 22, diam. 7* mill. 



Valley of Ayacmho, Peru, in arid places (Angrand). 



B. andoicus MOREL., Journ. de Conch., 1860, p. 373 ; Ser. Conch., 

 iii, p. 198, pi. 11, f. 13. PFR., Monogr., vi, p. 120. 



