210 SOUTH AMERICAN OPEAS. 



Bolivia : Banks of the Rio Grande, province of Santa Cruz 

 de la Sierra (Orb.), probably transported by water from 

 the mountains. 



Bulimus camba ORB., Yoy. dans 1'Amer. Merid. p. 263, pi. 

 41, f. 15-17 (not pi. 34, f. 4-7=5. munsterii) . PFR., Monogr. 



11, p. 115, probably not B. camba of later volumes of the 

 Monographia. Not B. (Peronaeus) camba PARAVICINI, Boll. 

 Mus. Zool. ed Anat. Comp. Univ. Torino, ix, no. 181, p. 7. 



This species is compared by d 'Orbigny with B. scabiosus 

 Sowb., but differs by its smoothness. The generic position 

 is uncertain. Unknown to me. It has a more convexly conic 

 spire than 0. gracile, according to the figures. 



14. 0. MIMOSARUM (Orbigny). PL 27, figs. 47. 



Shell turriculate, short, thin, translucent, smooth or with 

 a thick, deciduous epidermis usually marked with transverse 

 lines ; subumbilicate ; spire swollen at the third of its length, 

 towards the posterior extremity, and cylindric towards the 

 mouth; apical end obtuse; whorls 9, close, narrow and not 

 much raised. Aperture oval with acute margins. Color fawn- 

 gray. Length 10, diam. 4 mm. (Orb.). 



Bolivia : north side of the Rio Grande between that and the 

 village of Pucara, at the foot of the Andes, province of Valle 

 Grande, Dept. of Santa Cruz de la Sierra ; found chiefly at the 

 bases of mimosas ( Orbigny) . 



Helix mimosarum ORB., Mag. de Zool. 1835, p. 20. Bulimus 

 m., ORB., Voy. dans 1'Amer. Merid. Moll., p. 262, pi. 41, f. 



12, 13, 14. PFR., Monogr. ii, p. 162 ; iii, 398 ; iv, 457 ; vi, 96. 

 REEVE, C. Icon, v, pi. 68, f. 484. 



According to d 'Orbigny this differs from micra by the 

 closer and narrow whorls of the spire, the shorter, more pu- 

 poid shape, by the absence of striae, the transversely striated 

 epidermis, and finally by being double its size. It evidently 

 stands close to 0. beckianum, but differs by the absence of 

 sculpture. Pfeiffer describes a specimen in Cuming's collec- 

 tion as 12 mm. long with 10 convex whorls. 



15. 0. GLOMERATUM (Beeve). PL 27, figs. 51. 



Shell conically subulate ; not umbilicated ; whorls 9, rounded, 



