PLEKOCHEILUS. 127 



duced, nearly straight, expanded but scarcely reflexed ; basal lip 

 compressed, rounded, somewhat effuse; columellar margin short, 

 thick, reflexed above the perforation, dilated at the insertion, and 

 entering in a thick fold. Length 94, diam. 50, oblique length of 

 aperture 51, width 34 mill. (Rolle). 



Peru : Chanchamoyo. 



Bulimus (Dryptus) Jilocinctus ROLLE, Nachr. d. D. Malak. Ges. 

 1901, p. 93 (June 11, 1901). Not Bulimus Jilocinctus Reuss, 

 Sitzungsber. der K. Akad. Wissensch. Wien, xlii, Jahrg. 1860, p. 

 69 (1861). 



Intermediate between foveolatus Reeve and melanocheilus Nyst, but 

 differing from both in sculpture. Between the rather wide, almost 

 girdle-like spiral cords on the last two whorls, the growth-striae swell 

 into flat, oval knots, which project above the level of the girdles and 

 are more noticeable than the latter. They appear to be hollow. 

 Below they appear simply as short, projecting riblets. The first 2-J 

 whorls have a peculiar fine granular-wrinkled minute sculpture. 

 The coloration most resembles that of melanocheilus. 



It is evidently a member of the group of S. melanocheilus, and 

 perhaps most nearly allied to S. sangoce (vol. x, p. 45). 



S. BIT^ENIATUS (Nyst). Vol. x, p. 58. 



Specimens from Perene, Peru, are rougher than indicated by the 

 figures of this species, with more convex whorls, and narrower upper 

 light band, which is separated from the suture by a dark band. 

 Probably B. jelskii Lub. and alutaceus Rve. are merely varying 

 forms of bitceniatus. 



Genus PLEKOCHEILUS Guilding. 

 P. GIBBONIUS (Lea). Vol. x, p. 75. 



Another synonym is B. gibboreus Pfr.-Cless., Nomencl. Hel. Viv., 

 p. 227. 

 P. MABILLEI (Crosse). Vol. x, p. 79. 



Prof. v. Martens records a larger variety with wider lip, 32J mill, 

 long, 16^ wide, mouth 19 long, from the road toward the Llanos 

 from San Martin, Colombia, collected by Stiibel (Conch. Mittheil., 

 p. 158). 



P. SUBGLANDIFORMIS (MoilSS.). Vol. X, p. 80. 



Dohrn (Jahrb. ii, p. 305) finds that it varies notably in size, be- 

 tween length 38, diam. 18, apert. 20 mill, and 30, 15, 17 mill. 



