148 BULIMULUS-BOSTRYX-PERON^EUS. 



Variable in size. The last whorl is compressed around the um- 

 bilicus, which is generally narrow and not deep. In some individ- 

 uals the umbilicus is very narrow, and the basal angle tends to dis- 

 appear. It is wider than the somewhat allied B.williaind Pfr. 



B. PRODUCTUS Philippi. PL 4G, figs. 46, 47, 48. 



Shell compressed-perforate, oblong-turrited, rather solid, irre- 

 gularly striate or subrugulose, little shining, flesh-whitish, sometimes 

 marked with pale brownish linear streaks. Spire turrited, the apex 

 rather acute, suture impressed. Whorls 7-7 5, the embryonal whorls 

 glabrous and subcorneous, the rest moderately convex, last whorl 

 scarcely two-fifths the length of shell, a little compressed at base. 



Aperture subvertical, oblong, brownish-fleshy inside ; peristome 

 simple, thin, the outer lip unexpanded, slightly arcuate above ; col- 

 umellar lip dilated above, reflexed, spreading over the perforation. 

 Alt. 21 i, diam. 7 mill. ; alt. of aperture 8 mill. (Pfr.). 



Sierra Cotahuasi, Peru (Raimondi). 



B. productus Phil., PFR., Malak. BL, xiv, p. 77, 1867; Novit. 

 Conch., p. 353, pi. 82, f. 23-25 ; Monogr., vi, p. 140. 



Very similar to the figure of B. andoicus Morel., but the aperture 

 is not angular at base. 



B. ALBICOLOR Morelet. PL 46, figs. 49, 50. 



Shell rimate, rather solid, oblong-turrited, irregularly and deli- 

 cately striatulate, shining, whitish. Spire turrited, the apex acute, 

 corneous, sometimes violaceous. Whorls 8, convex, the last shortly 

 attenuated at base, somewhat compressed around the narrow rima- 

 tion, and nearly three-sevenths the length of shell. 



Aperture oblong oval, tawny inside ; peristome simple, acute, un- 

 expanded, the outer margin lightly arcuate, columellar margin very 

 narrowly dilated above, reflexed. (il/ore/.). 



Alt. 28, diam. 9 mill, (typical). 



Alt. 18, diam. 7 mill, (small form). 



Huunta, and valley of Apurimac R., Peru (Angrand). 



B. albicolor MORELET, Journ. Conch., 1860, p. 374; Ser. Conch., 

 iii, p. 199, pi. 11, f. 9. PFR., Monogr., vi, p. 135. 



A shell of variable size, uniform white outside, russet fawn color 

 within, with the margins of the peristome darker and the earlier two 

 whorls of a fawn or purple shade. It is engraved with superficial, 

 irregular strue, and marked with a very small number of black is-h 



