BULIMULUS-SOUTH AMERICAN. 63 



Bulimus fontainii ORB., Voy. Am. Merid., p. 273. PFR., Monogr., 

 ii, p. 220. B. fontainei PFR., Monogr., iv, p. 505. HIDALGO, 

 Journ. de Couchyl., 1875, p. 130, pi. 7, f. 6 ; Mol. Viaje al Pacif., 

 p. 126. 



On some specimens there is a whitish spiral line at the middle of 

 the last whorl. It is allied to B. unicolor, but the aperture is rather 

 smaller. 



B. UCAYALENSIS (Crosse). PI. 10, fig. 98. 



Shell nearly covered perforate, pyramidal-elongate, thin, pellucid, 

 nearly smooth, uniform corneous-whitish. Spire quite long, the 

 apex somewhat obtuse ; sutures well marked. Whorls 5j, slightly 

 convex, the last a little longer than the spire and rounded at base. 

 Aperture nearly oval, whitish-corneous inside ; peristome simple and 

 whitish, the margins somewhat separated, columellar margin vault- 

 ingly reflexed, covering the greater part of the perforation ; basal 

 and outer margins a little reflexed and nearly acute. Alt. 13, diam. 

 6J mill. ; alt. of aperture 6, width 4? mill. (Crosse*). 



Banks of the Ucayali River, Ecuador (Orton). 



Bulimus ucayalensis CROSSE, Journ. de Conch., xix, 1871, pp. 

 229, 317, pi. 13, f. 4. 



B. MOLECILLUS (Eeeve). PL 10, fig. 3. 



Shell nearly covered perforate, oblong, somewhat solid, striatu- 

 late, little shining, slightly diaphanous, pale corneous. Spire ovate- 

 conic, rather obtuse. Whorls 6, a little convex, the penultimate 

 whorl prominent, last whorl shorter than the spire, somewhat atten- 

 uated at base. Columella folded, receding. Aperture oblique, 

 narrowly oval ; peristome simple, unexpanded, the right margin 

 very slightly arcuate, columellar margin dilated, flesh-colored, sub- 

 appressed and reflexed. Alt. 17J, diam. 7 ; alt. of aperture 8, 

 width 4 mill. (PfV.). 



Tarma, Peru (Jelski). 



Bulimus molecillus REEVE, Conch. Icon., pi. 77, f. 565 (Aug., 

 1849). PFR., Monogr., iii, p. 436. LUBOMIRSKI, P. Z. S., 1879, p. 

 725. 



The locality of the Cumingian specimens was unknown, but Lub- 

 omirski identifies it from Peru. The distinctly folded columella is 

 hardly a character of the present subgenus, but I do not know 

 "where else to place it, having seen no specimens. 



