280 DRYM^EUS, SOUTH AMERICAN. 



Mr. Ancey writes substantially as follows: Among species of the 

 same region known to me, none but B. torallyi Orb. has strong affin- 

 ities with B. borellii. In the latter the spire is usually much 

 lengthened ; but among the varieties of B. torallyi found by d'Or- 

 bigny there is one shell with the spire almost as long as in normal 

 B. borellii, but differing in other characters. 



B. borellii is yellowish-white or ochre-tinted, irregularly orna- 

 mented with brown rays of greater or less width, and following the 

 growth-lines, narrower and lighter colored rays between them. 

 The shell is duller, less glossy than the specimens I have seen of B. 

 torallyi, and the ground color yellower ; the perforation, almost open 

 in borellii, is reduced to a mere chink, almost completely covered, 

 in B. torallyi. The embryonic whorls are densely and very finely 

 punctate. 



D. MONTAGNEI (Orbigny). PL 44, figs. 12, 13, 14. 



Shell elongated, distinctly umbilicate, thin, transparent, smooth. 

 White or distinctly reddish-tinted, ornamented with wide longitudi- 

 nal brown flames which are spaced and generally lacerated, occupy- 

 ing the posterior two-thirds of the last whorl ; the rest of the surface 

 anteriorly is marked with fine, transverse brown lines, which usually 

 appear also between the flames ; these intervals in other specimens 

 being speckled or marbled with small, irregular brown spots. Spire 

 lengthened, conic, rather acute at the apex, composed of 6 slightly 

 convex whorls separated by smooth, little impressed sutures. Aper- 

 ture quite large, oval, rounded, the peristome thin and acute, some- 

 times showing a tendency to expand ; columella arcuate, leaving a 

 wide and deep umbilicus. Alt. 21, diam. 9 mill. (Orb.~). 



Near Petaca, on the slope of the easternmost mountains of the Bo- 

 livian Andes, descending to the plain of Santa Cruz de la Sierra, 

 Bolivia, under dead leaves and stones in moist places. 



Helix (Bulimus) montagnei ORB., Voy. Amer. Merid., pi. 32, f. 5, 

 6, 7. Bulimus montagnei ORB., t. c. p. 286. PFR., Monogr., ii, p. 

 Ill ; iii, 344 ; iv, 486 ; vi, 132 ; viii, 168. Bulimus castrensis PFR., 

 P. Z. S., 1846, p. 115 ; Monogr., ii, p. 213 ; iii, 425. REEVE, Conch. 

 Icon., pi. 59, f. 396. Otostomus montagnei H. AD., P. Z. S., 1866, 

 p. 442.~ 



According to H. Adams, Bartlett collected this species in eastern 

 Peru. It differs from D. torallyi in being more conic, shorter, 

 openly umbilicate, thin and fragile, and in the more varied colora- 

 tion. 



