236 DRYLLEUS, SOUTH AMERICAN. 



rotund basally. Aperture oblique, angulate-oval ; peristome thin, 

 the right margin narrowly expanded, columellar margin dilated 

 above. Alt. 21 , diam. 101 mill. ; aperture 101 mill, long, 5f wide. 



Brazil (Curm'ng coll.). 

 Bulimus bucia (BEHN on label), PFR., Malak. BL, vi, 1859, p. 39 ; 

 Monogr., vi, p. 52. 



Group of D. orobcenus. 

 D. OROBCENUS (Orbigny). PI. 44, figs. 87, 88. 



Shell oblong, subumbilicate, rather thin with irregular and rather 

 wrinkle-like growth lines ; uniform yellowish tawny, the apex paler. 

 Spire long, with convex outlines, acuminate, the apex a little obtuse. 

 Whorls 8, rounded, separated by a deep smooth suture. Aperture 

 two-fifths the total length, oval, whitish rufous inside ; the peristome 

 very distinctly thickened, whitish; columella oblique, solid, flat. 

 Alt. 40, diam. 16 mill. ( Orb.'). 



Mt. Biscachal, near the village of Carcuata, at the eastern edge of 

 the province of Yungas, Bolivia, on the northeastern slope of the 

 eastern Cordillera, in a very moist wood, over 3000 meters eleva- 

 tion. ( Orb.). 



Helix orobcena ORB., Mag. de Zool., 1835, p. 17. Bulimus oro- 

 bonus ORB., Voy., p. 293, pi. 39, f. 3, 4. PFR., Monogr., ii, p. 143 ; 

 iii, p. 380. 



Reeve's B. cuzcoensis is evidently closely allied. 

 D. CUZCOENSIS (Reeve). PI. 44, fig. 89. 



Shell deeply rimate, oblong-turrited, rather thin, irregularly stri- 

 ated, little shining; tawny-reddish. Spire convexly turrited, the 

 apex acute ; whorls 7, a trifle convex, the last shorter than the spire, 

 subrotund at base. Columella obsoletely folded, somewhat reced- 

 ing. Aperture little oblique, irregularly oval ; peristome simple, 

 the right margin narrowly expanded, columellar margin much dil- 

 ated, rugose, reflexed, rather flattened. Alt. 36, diam. 13 ; aperture, 

 alt. 17 width 9 mill. (Pfr.). 



" Cuzco, Bolivia" (W. Lobb). 



Bulimus cuzcoensis REEVE, P. Z. S., 1849, p. 98 ; Conch. Icon., 

 pi. 71, f. 514. PFR.. Monogr., iii, p. 344. 



Evidently allied to D. orobcenus, of which Pfeiffer thinks it may 

 be a variety. 



