BULIMULUS-SCUTALUS. 17 



Somewhat intermediate between mutabilis and versicolor, but the 

 granulation is weak, almost obsolete as in the latter, and the shell is 

 more solid than either. 



B. AQUILUS (Eeeve). PL 5, figs. 72, 73. 



Shell umbilicated, ovate-conic, solid, regularly decussated with 

 longitudinal and spiral lines. White, with irregularly scattered 

 brown spots. Spire conic, rather acute, whorls 5, somewhat convex, 

 the last a little longer than the spire, somewhat compressed around 

 the narrow umbilicus ; columella white, subplicate above. Aperture 

 little oblique, oblong-oval ; peristome simple, the right margin nar- 

 rowly expanded, columellar margin dilated and reflexed. Alt. 27, 

 diani. 14 mill.; aperture, 15 mill, long, 7 wide inside. (Pfr."). 



Tacna, Peru (C timing). 



Bulimus aquilus REEVE, Conch. Icon., pi. 22, f. 138 (1848). 

 PFR., Monogr., iii, p. 338. 



"Approaching somewhat in character to B. versicolor " (Rve.~). It 

 may prove to be a Lissoacme of the group of B. erythrostoma. 



Group of B. tupacii. 



Species of the Andean plateau in Peru, and the adjacent, physi- 

 cally similar portion of Bolivia. The shells are larger, more solid, 

 and with rougher sculpture than in the group of B. culmineus. 



B. REVINCTUS (Hupe). PI. 3, figs. 34 to 40. 



Shell narrowly umbilicate, ovate obese, moderately solid, luster- 

 less; buff- white, with numerous brown spiral bands and usually a 

 few oblique streaks (or sometimes lacking spiral bands). Surface 

 rather closely, irregularly wrinkle-striate and obsoletely granulated 

 by decussating spirals in places; the apical whorls with fine, close, 

 wavy, vertical strice, beautifully regular and clear cut. Spire short, 

 the apex obtuse, suture impressed and irregularly creuulated. 

 Whorls 5 to 5, moderately convex, the last fat-oval. 



Aperture larg^, broad-ovate; outer lip blunt, unexpanded, colu- 

 mella concave, the margin broadly dilated above. 



Alt. 29, diam. 19 mill. 



Alt. 27, diam. 17 mill. 



Bolivia : Cavari, Prov. Cochabamba, not far southeast from In- 

 quisivi (Orb.); Peru: Tarma (Isern) ; Huancabelica ; from Tarma 

 to Cuzco (Angrand) ; varieties at Huando and Sicaya (Angrand). 

 2 



