160 BULIMULUS-BOSTRYX-LISSOACME. 



B. ACALLES Pfeiffer. PI. 50, figs. 53, 54. 



Shell subperforate, ovate-conic, thin, longitudinally closely stri ate 

 and distantly plicate, scarcely shining, tawny-gray. Spire conic, 

 rather obtuse, tawny. Whorls 4, slightly convex, the last longer 

 than the spire, rotund at base. Coluinella slightly arcuate, some- 

 what receding. Aperture oblique, oval, tawny-flesh colored inside ;: 

 peristome simple, unexpended, the right margin arcuate, columellar 

 margin reflexed above, somewhat adnate. Alt. 10, diam. 6 mill. ;. 

 aperture 6i mill, long, 4 wide. (Pfr.~). 



Peruvian Andes (Cuming coll.). 



Bulimus acalles PFR., P. Z. S., 1851, p. 258 ; Conchyl. Cab., p. 84, 

 pi. 30, f. 27, 28 (young); Monographia, iii, p. 410; iv, 479; vi, 

 J26. 



The types and only figured specimens were young. Pfeiffer sub- 

 sequently described the adult as perforate, with 5 whorls, the last 

 slightly longer than spire. Alt. 14, diam 1\ mill.; aperture 1\ 

 mill, long, 4 wide. 



B. EROSUS Broderip. PI. 49, figs. 34, 35, 36. 



Shell rimate-umbilicate, ovate-conic, rugose-striate, shining; opaque 

 white, with scattered corneous dots. Spire conic, the apex obtuse, 

 pale corneous. Whorls 6, convex, the last about as long as the 

 spire. Columella arcuate. Aperture oval, very pale brown inside ; 

 peristome acute, sublabiate, the columellar margin broadly reflexed, 

 free, horizontally adnate above. Length 23, diam. 12 ; aperture 12 

 mill, long, 6* wide. (P/r.). 



Iquiqui, Peru (Cuming).. 



Bulinus erosus BROD., P. Z. S., 1832, p. 106. Bulinus arrosus 

 SOWB., Conch. Illustr., f. 34. Bulimus erosus PFR., Monogr., ii, p. 

 225 ; Conchyl. Cab., p. 236, pi. 63, f. 5, 6. REEVE, Conch. Icon., pi. 

 22, f. 140. 



The detail of character is not much unlike that of B. conspersus, 

 but it is a shell of larger size and much more solid growth. {Rve.}. 



B. CONSPERSUS Sowerby. PI. 49, fig. 27. 



Shell ovate-subacuminate, thin, corneous, the apex a little obtuse. 

 Whorls 6, rounded, guttate and lineated with whitish. Aperture 

 ovate, of the same color ; peristome acute, thin ; umbilicus small. 

 Length '65, diam. '4 inch. (Sowb.). 



Near Lima, Peru (Cuming, Beechey, Paz). 



