BULIMULUS-BOSTRYX-LISSOA< ME. 183 



corneous. Whorls 7, a little convex, at the base the last is rotund, 

 rugose and brownish. 



Aperture a little exceeding two-fifths the total alt., slightly oblique, 

 oval, brown inside ; peristome simple, thin and unexpanded ; col- 

 uraellar margin straightened, dilated and reflexed. Alt. 24-29, 

 diam. 10-10* mill. (Morel.}. 



Valley of Jatija and slopes of Cuzco, Pern (Angrand). 



Bulimus radiatus MOREL., Ser. Conch., iii, p. 188, pi. 9, f. 2. 

 PFR., Monogr., vi, p. 136. 



We come now to a series of Bulimus of which B. striatiis mav be 



J 



considered, if not the type, at least the earliest known representative. 

 The present form is distinguished at first sight by the tawny lines, 

 always quite distinct though more or less dark, which zebra-stripe its 

 surface. Toward the termination of the last whorl, the irregularly 

 spaced lines become wider, diminish in intensity, and little by little 

 merge into a uniform violaceous tint, the strise becoming more pro- 

 nounced, giving the surface a rugose appearance. The spire is 

 longer than in B. munsteri Orb., the shell more solid, rougher, and 

 the color of the aperture is different. The habits also are diverse, 

 B. munsteri living under stones or moss, while B. radiatus lives in 

 the open air, on cacti, etc. B. nigropileatus Reeve, an umbilicated 

 shell, has the aperture wider and the last whorl more ventricose. 

 Finally, the absence of an umbilicus and the feebleness of the col- 

 umellar dilation are the principal characters separating it from />'. 

 stenacme Pfr. (Morel.). 



B. OROPHILUS Morelet. PI. 46, figs. 55, 56, 57. 



Shell umbilicated, oblong-turritecl, rather solid, somewhat shining, 

 irregularly and obsoletely costulate-striate ; whitish, marked with a 

 few blackish dots ; spire elongated, attenuated toward the corneous 

 and rather acute apex. Whorls 7, a little convex, the last usually 

 streaked with rufous, sometimes banded, compressed around the um- 

 bilicus, a little shorter than the spire. 



Aperture oblique, oblong-oval, fleshy-fulvous inside ; peristome 

 simple, unexpanded, the margins somewhat converging, colmnellar 

 margin dilated above, and reflexed. Alt. 22, diam. 9 mill. (Morel.). 



Temperate vallies of the plateaux of Cuzco, Peru, notably at Tala- 

 vera, Silqite, Incahuasi and Mollepata, on cacti of the genus Cereiis 

 (Angrand). 



