DRYM^US, SOUTH AMERICAN. 227 



somewhat twisted, vertical. Aperture oblong, sinuously effuse at 

 base, reddish within ; peristome thickened, broadly expanded, 

 roseate, the terminations joined by a wide, deep rose colored callus ; 

 columellar margin receding, as though truncate, at base. Alt. 70, 

 diam. 29 mill. (Pfr.). 



Ambo, near Huanuco, Peru. 



Bulinus crichtoni BROD., P. Z. S., 1836, p. 44. SOWERBY, Conch. 

 Illustr., f.GQ.Bulimus crichtoni REEVE, Conch. Syst., ii, pi. 173, f. 

 4 ; Conch. Icon., pi. 39, f. 240. PFR., Monogr., ii, p. 28. Otostomus 

 crichtoni H. ADAMS, P. Z. S., 1866, p. 442. 



" The apex of the shell under description, the only specimen I 

 ever saw, is broken. It will be observed that the specimen is 

 notched at the base, but I suspect that this arises from accidental 

 distortion " (Broderip). 



A second specimen, collected by Bartlett in eastern Peru, is re- 

 ported by H. Adams. May be a Porphyrobaphe. 



D. NARCISSUS (Albers). PL 29, figs. 29, 30. 



v Shell profoundly and compressed umbilicate, turrited-oblong, 

 rather solid and somewhat smooth, very minutely spirally striated 

 under the lens, a little shining, chalky. Spire convex-turrited, the 

 apex acute. Whorls 6*, the upper flat, latter two convex, the last 

 shorter than the spire, somewhat roughened, ascending in front, 

 somewhat compressed at base. Columella folded above. 



Aperture subvertical, oblong, purple-violaceous inside ; peristome 

 purple, inwardly blackish, the right margin broadly expanded, 

 columellar margin much dilated, separated from the preceding 

 whorl by a groove at its insertion, sinuously spreading, a little re- 

 flexed. Alt. 36, diam. 14 mill.; aperture with peristome 18 mill, 

 long, 12 wide (P/r.). 



U. S. of Colombia. 



Bulimus narcissus ALBERS, Malak. Bl., 1854, p. 217. PFR., 

 Monogr., iv, p. 384 ; Novit, Conch., i, p. 33, pi. 9, f. 10, 11. 



Somewhat like Neopetr&us vadum Pils. in appearance, but that 

 species has keeled upper whorls, no groove at root of the columella, 

 no minute spiral striation, and a differently colored mouth and lip. 

 Pfeiffer considers narcissus near to D. lilacinus Reeve. 



D. EXCORIATUS (Pfeiffer). 



Shell openly umbilicated, ovate-acuminate, rather thin, striatu- 

 late, under the lens punctulate, not shining, flesh colored. Spire 



