236 DRYM.EUS, SOUTH AMERICAN. 



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

 the right margin narrowly expanded, columellar margin dilated 

 above. Alt. 2H, diam. 101 mill. ; aperture lOf mill, long, 5f wide. 



Brazil (Cuming coll.). 



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

 Moiiogr., vi, p. 52. 



Group of D. orobcenus. 



D. OROB^NUS (Orbigny). PL 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 milage of Carcuata, at the eastern edge of 

 the province of Yung as, 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- 

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

 iii, p. 380. 



Keeve's B. cuzcoensis is evidently closely allied. 



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



Shell deeply rim ate, 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. (P/r.). 



" 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. 



