290 DRYM.EUS, SOUTH AMERICAN. 



B. rectilinearis Pfeiffer, is also allied to the present species; but 

 it is more sharply conical, shows but the faintest traces of spiral 

 striation, has not a black apex, is differently banded, and the col- 

 umellar and umbilical characters are not similar. 



D. MILTOCHROUS (Albers). PI. 48, figs. 28, 29. 



Shell compressed -umbilicate, ovate-turrited, rather thin, smooth, 

 shining. Brownish brick colored with two black, white streaked 

 bands, one at the suture, the other at the base, and one white girdle 

 below the periphery. Spire turrited, rather acute. Whorls 7, a 

 little convex, the last three-sevenths the total length of the shell, 

 slightly tapering at base. Aperture slightly oblique, truncate-oblong ; 

 peristome simple, the right margin a trifle expanded, spreading 

 above, the columellar margin membrane-like, very much dilated 

 above. Alt. 31, diam. 13 mill. ; aperture 14 mill, long, 7? wide 



Upper course of the Mar anon River, in Peru (or Ecuador) ( Wars- 

 zewicz). 



Vidimus miltochrous ALB., Malak. BL, i, 1854, p. 217 PFR., 

 Novit. Conch., i, p. 36, pi. 10, f. 3, 4 ; Monogr., iv, p. 403. 



D. VESTALIS (Albers). 



Shell perforate, ovate-oblong, solid, lightly striatulate, opaque, 

 chalky ; spire conic, the apex acute, roseate. Whorls 8, the upper 

 flattened, those following more convex, the last whorl forming three- 

 sevenths the total alt. of shell, tapering at base and areolate with 

 lilac. Aperture little oblique, truncate-oval ; peristome acute, rose- 

 lipped within, the right margin unexpanded, columellar margin 

 lilac-colored, thin, shining, refiexed and overhanging. Alt. 19, diam. 

 9 ; alt. of aperture 8, width 4f mill. (P/r.). 



On the Maranon River, " Colombia " (AVarscewicz). 



Bulimus vestalis ALB., Malak., Bl., i, p. 218 (1854). PFR., 

 Monogr., iv, p. 498. 



D. ANCEPS (Albers). PI. 49, figs. 66, 67. 



Shell narrowly perforate, stibfusiform-oblong, rather solid, longi- 

 tudinally plicatulate ; pale buff, ornamented with brown spots ar- 

 ranged in bands and streaks, obsolete on the last whorl. Spire a 

 little convexly turrited, sub-acute. Whorls 7, moderately convex, 

 the last forming three-sevenths the total length, somewhat tapering 

 at base, Columella rather straight, receding. Aperture slightly 



