294 DRYM^EUS, SOUTH AMERICAN. 



and bands through ; peristome thin, the margins approaching, right 

 margin somewhat expanded, columellar margin dilated, conspicuous. 

 Alt. 31, diam. 12 mill. (Morel.'). 



Western slope of the Vilcanote chain, Peru : frequent in the Uru- 

 bamba Valley; at Limatambo, Ollantaitambo and Yucay ; the white 

 variety at Pire, a colder locality in the same mountain chain 

 (Angrand). 



Bulimus longinquus MORELET, Series Conchyliologiques, iii, p. 

 195, pi. 11, f. 2 (April, 1863). 



Morelet mentions a unicolored, white form (fig. 93), and another 

 latticed with bands and streaks of purple-brown. 



It is not without some resemblance to B. pcecilus, at least in form, 

 the coloration differing. It is very constant in proportions, com- 

 posed of 7, rarely 8, whorls. The long spire tapers gradually toward 

 the apex, which is acute and nearly always colorless. The most 

 variable part of the shell is the umbilicus, which is usually quite 

 open, but sometimes reduced to a mere fissure. The straight and 

 simple peristome shows a perceptible tendency to expand toward 

 the base. The shell is thin, though not without some degree of 

 solidity. It is superficially and quite unequally engraved with striae, 

 ornamented on a whitish ground with oblique, reddish-brown lines, 

 sometimes regularly spaced, sometimes partially effaced ; and there 

 are also commonly five or six narrow, frequently interrupted bands 

 on the basal moiety of the last whorl. 



B. longinquus differs from pcecilus in having the spire a little more 

 slender, the aperture narrower, fawn colored inside, the peristome 

 with a tendency to expand, and with convergent insertions; finally 

 in the color pattern. 



It inhabits a climate suitable for the culture of maize, while B. 

 virgultorum (Vol. X, p. 168) lives on the eastern slope of the same 

 mountain chain, some 400 or 500 meters lower down, in the coffee 

 tree region. It occurs on cacti and spiny plants. 



D. VIRGULTORUM (Morelet). Vol. x, p. 168. 



This species, included in Lissoacme, is probably a Drymceus. 

 Morelet gives the localities Corihuairachina, Urubamba, Calca, 

 Sicuani, Talavera and the adjacent valleys of La Paz and Chuqui- 

 saca. The mineral constitution of the region is similar to that 

 described under D. longinquus, but the soil is deeper, supporting a 

 richer vegetation. The shell is thinner than D. longinquus, more 



