DRYM^US, SOUTH AMERICAN. 233 



The oblique aperture is oval and ends below in a sort of obtuse 

 beak ; the right margin is a little expanded, the left is more so, and 

 partly covers the umbilicus. (Moricand"). 



I have not seen this species, which may be an Odontosiomus of 

 the subgenus Moricandia. 



D. GUEINZII (Pfeiffer). 



Shell profoundly rimate, oblong-conic, thin, rather smooth, shin- 

 ing; whitish, ornamented with narrow brown streaks which are un- 

 dulating toward the base. Spire conic, rather acute. Whorls 6, 

 slightly convex, the last slightly shorter than the spire, somewhat 

 attenuated basally, violaceous at the umbilical chink. Columella 

 compressed, somewhat twisted, violaceous. Aperture slightly oblique, 

 truncate oblong, lilac colored inside ; peristome thin, the right mar- 

 gin strongly curved, broadly expanded, columellar margin broad. 

 Alt. 23, diam. 10 mill. ; aperture with peristome Hi mill, long, in- 

 side 5 wide. (Pfr.). 



Moyobamba, Peru (Gueinzius in Cuming coll.). 



Bulimus gueinzii PFR., P. Z. S., 1856, p. 330 ; Monogr., iv, p. 387. 

 Otostomus (Leiostracus) gueinzii H. AD., P. Z. S., 1870, p. 375. 



D. SIMILARIS (Moricand). PI. 42, fig. 60. 



Shell deeply rimate-umbilicate, ovate-conic, rather thin ; white 

 with longitudinal serrated brown streaks which do not extend over the 

 base, leaving an immaculate umbilical tract, and terminate far short 

 of the suture above, in a series of spots forming an narrow interrupted 

 (or brown and white articulated) spiral band. Glossy and smooth, 

 showing an almost obsolete spiral striation under the lens. Spire 

 conic the apex subobtuse, If earlier whorls with typical Drymceus 

 sculpture. Whorls 5 to nearly 6, slightly convex, the last a little 

 ascending in front, convex below. 



Aperture a little oblique, colored within like the outside, slightly 

 exceeding half the length of the shell ; peristome white, well ex- 

 panded below, columella concave below, with a slight fold above, 

 the edge reflexed, leaving an open but short umbilical chink. 



Alt. 25, diam. 13* ; length of aperture 13 mill. 



Alt. 20f, diam. 10; length of aperture 10? mill. 



Moyobamba, eastern Peru (Moric.). 



Bulimus similaris MORICAND, Journ. de Conchyl., 1856, p. 177, 

 pi. 6, f. 8. PFR., Monogr., iv, p. 391. Otostomus similaris H. 

 ADAMS, P. Z. S., 1870, p. 375. 



