72 BULIMULUS-SOUTH AMERICAN. 



B. SIMPLEX (Hupe). PI. 11, figs. 31, 32. 



Shell thin, fragile, corneous, ovate-conic with acuminate spire, 

 acute at apex ; whorls 6-7, narrow and convex, the last more swollen, 

 about half the total length. Aperture oval ; peristome thin, sharp, 

 dilated toward the base ; columellar margin dilated above, partly 

 covering the small umbilical fissure. Alt. 15, diam. 8 mill. (Hupe). 



Peru, (Castelnau). 



Bulimus simplex HUPE (Castelnau's) Anim. nouv. on rares * 

 Ame'r. du Sud Moll., p. 53, pi. 9, f. 6 (1857). PFR., Malak. BL, 

 1858, p. 166. 



Allied to B. tenuissimus, but more swollen, and the spire is more 

 acuminate (Hupe). Pfeiffer considers this a synonym of B. four- 

 miersi, but that seems a shorter shell. The locality given above is 

 doubtful. The name is preoccupied by Jonas in Bulimus. 



B. HELOICUS (d'Orbigny). Vol. X, p. 193, pi. 51, figs. 12, 13. 

 Probably belongs to this group rather than to Lissoacme. 



B. NIVALIS (d'Orbigny). PI. 11, figs. 35, 36. 



Shell subim perforate, conic-ovate, thin, smooth ; greenish-corneous, 

 here and there streaked with chestnut; spire conic, obtuse. Whorls. 

 5, a little convex, the last longer than the spire, rounded at base ; 

 columella very lightly arcuate. Aperture somewhat oblique, acu- 

 minate-oval ; peristome simple, unexpanded, the columellar margin 

 thin, reflexed and adnate. Alt. 16, diam. 8f ; aperture 9 mill, long, 

 5 wide. (P/r.). 



Mountains around Potosi, Bolivia, 5000 meters alt., under stones, 

 etc. (Orb.). 



Helix nivalis ORB., Mag. de Zool., 1835, p. 12. Bulimus nivalis 

 ORB., Voy., p. 287, pi. 32, f. 8, 9. PFR., Monogr., ii, p. 170 ; iii, 

 406 ; iv, 466 ; vi, 107. 



In form like B. oblongus on a very small scale, but thin and sharp- 

 lipped. Orbigny gives alt. 14, diam. 9 mill., as the size. The sub- 

 generic position is doubtful. 



B. PLICATULUS (Pfeiffer). Unfigured. 



Shell umbilicated, ovate-conic, rather thin, sculptured with low, 

 somewhat varix-like folds ; hardly shining, pale gray, irregularly 

 painted with very narrow white and brown streaks. Spire conic, 

 acute. Whorls 7, slightly convex, the last a little shorter than the 

 spire, base somewhat compressed around the moderate sized, rounded 



