1 68 BULIMULUS-BOSTRYX-LISSOACME. 



B. APERTUS Pfeiffer. Unfigured. 



Shell umbilicated, ovate-conic, solid ; sculptured with close, strong 

 folds, which become evanescent on the last whorl ; little shining, 

 whitish. Spire regularly conic, the apex corneous, somewhat acute. 

 Whorls 7, convex, the last about three-sevenths the total length, sub- 

 compressed around the open, pervious umbilicus. 



Aperture little oblique, oval ; columella subplicate above, sub- 

 angulately arcuate; peristome simple, the margins converging, the 

 right margin unexpanded, columellar margin dilated, spreading. 

 Alt. 19, diam. 10; aperture 8 mill, long, 5 wide. (Pfr.'). 



Habitat unknown. 



Bulimus apertus PER., Malak. Bl., ii, 1855, p. 107 ; Monogr., iv, 

 p. 492. 



Referred by Pfeiffer to Rhabdotus, but its systematic position is 

 uncertain. In a later volume of the Monographia the locality 

 " Peru ? " is given. 



B. TUMIDULUS Pfeiffer. PI. 49, figs. 28, 29. 



Shell nearly covered perforate, ovate-acuminate, thin, striatulate, 

 shining ; whitish, banded with chestnut denticulate lines and inter- 

 ruptedly streaked. Spire conic, somewhat mucronate, the mucro 

 corneous. Whorls 7, flattened, the last swollen, as long as the spire. 

 Columella rather straight, surrounded by a reddish area. 



Aperture oval, colored within like the outside ; peristome simple, 

 acute ; columellar margin reddish, reflexed, nearly closing the per- 

 foration. Alt. 23, diam. 12 mill. ; aperture 13 long, 7 wide. (P/V.). 

 Ambo, (Cuming) ; and Huanuco (Angrand), Peru. 



Bulinus inflatus BROD., P. Z. S., 1836, p. 45. SOWB., Conch. 

 Illustr., f. 6 1 . Not Bulimus inflatus Lam. Bulimus tumidulus PFR., 

 Symbolic, ii, p. 123 ; Monogr., ii, 193. REEVE, Conch. Icon., pi. 

 19, f. Ilia, b. DESK, in Fer., Hist., p. 89, pi. 157, f. 16-19.- 

 MORELET, Ser. Conch., iii, p. 194. 



Besides the typical coloring described above (fig. 29), there is a 

 fleshy-whitish form with a few reddish lines and series of ruddy dots 

 (fig. 28), and a bandless white form, fawn-tinted at the base. 



B. VIRGULTORUM Morelet. PI 49, figs. 15, 16, 17, 18, 19, 20, 21, 



22. 



Shell moderately umbilicated, ovate-conic, rather thin, shining, 

 obsoletely costulate-striate ; whitish or pale tawny-buff, variously 



