DRYM-ffiUS, SOUTH AMERICAN. 241 



convex, the last slightly shorter than the spire, rectangularly carin- 

 ated at base, as if cut off. Columella arcuate. 



Aperture little oblique, rhomboid-oval, rose colored within : per- 

 istorae slightly expanded, purple, margins joined by a purple callus 

 the columellar margin reflexed, subadnate. Alt. 28, diam. 13 ; alt. 

 of aperture 13* mill., width 7*. (P/r.). 



Quito (Cuming coll.). 



Bulimus abseissus PFR., P. Z. S., 1855, p. 116 ; Monogr., iv, p. 

 376. Goniostomus abseissus Miller, Malak. Bl. xxv, 1873, p. 192 ; 

 and (n. F.) i, pi. 6, f. 5. Hamadryas abseissus COUSIN, Bull. Soc. 

 Zool. Fr. 1887, xii, p. 219. 



This species would seem to be allied to D.fallax or D. nystianus. 

 The figure is from Miller. 



D. BOURCIERI (Pfeiffer). PI. 33, figs. 45, 46. 



Shell imperforate, ovate, moderately solid ; opaque white with 

 wide longitudinal flesh-brown clouds and darker spiral lines (or 

 " fleshy-gray variegated with darker ") ; somewhat shining. Sculpt- 

 ure : numerous unequal, irregularly spaced spiral grooves intersecting 

 closer wrinkles of growth, the spirals becoming obsolete on the 

 earlier whorls. Spire conic, apex slightly obtuse. Whorls 5J, but 

 slightly convex, separated by crenulated sutures, the latter half of 

 the last whorl bluntly bid conspicuously angular below, the base flat- 

 tened. 



Aperture decidedly over half the total length, ovate, subvertical, 

 whitish with zigzag brown streaks within, peristome narrowly ex- 

 panded, outer margin regularly arcuate, white or rose colored ; col- 

 umella concave, slightly folded above, its edge reflexed and ap- 

 pressed at the umbilical position, passing into a thin rose-colored 

 parietal callus. 



Alt. 24, diam. 13; alt. of aperture 12'8 mill. 



Pichincha, Ecuador (Bourcier). 



Bulimus bourcieri PFR., P. Z. S., 1852, p. 153 ; Mouogr., iii, p. 

 314; Conchyl. Cab., p. 98, pi. 32, f. 3, 4. Bulimus (Thaumastus) 

 bourcieri ALB., Die Hel., p. 215. Otostomus (Hamadryas) bourcieri 

 ADS., Gen. Rec. Moll., ii, p. 150. Goniostomus bourcieri MILLER, 

 Mai. BL, xxv, p. 192, 1878. Hamadryas bourcieri COUSIN, Bull. 

 Soc. Zool. France, 1887, p. 219. 



Similar to D. fallax in the basal angulation, though it is far less 

 accentuated in this species. The spirally grooved surface is char- 

 acteristic. 

 16 



