48 ODONTOSTOMUS. 



O. OCCULTUS (Reeve). PI. 9, fig. 19. 



Shell slightly rimate, fusiform, slender, thin, smooth, pellucid, 

 whitish. Spire long, the apex rather acute, suture impressed. 

 Whorls 8J, rather flat, the last about one-third the total length, 

 compressed at base, streaked with chestnut around the aperture on 

 both sides. Aperture vertical, oblong, narrow ; columella provided 

 with a triangular tooth ; peristome thin, the right margin narrowly 

 expanded, two-toothed, basal and columellar margins broadly dilated. 

 Length 23, diam. in the middle scarcely 6 mill.; aperture with peri- 

 stome 8 mill, long, 4 wide (Pfr., from type). 



Brazil (Cuming coll.). 



Bulimus occultus REEVE, Conch. Icon. pi. 83, f. 617 (December 



1849) PFK. Monogr. iii, p. 368 ; iv, 436 ; vi, 76 Pupa reevei 



DESHAYES in Fer., Histoire ii, p. 214, pi. 156, f. 18, 19 (1851). 

 Odontostomus occultus Rve., DOHRN, Jahrb. d. D. Malak. Ges., 1882, 

 p. 104. Bulimus parallelus PFR., P. Z. S., 1856, p. 389; Monogr. 

 iv, p. 445. 



Much like 0. bahiensis, but with two folds within the outer lip. 

 According to Dohrn these folds are variable in development, at. least 

 in the form or variety described as B. parallelus or P. reevei. 



Var. REEVEI (Deshayes). PI. 9, figs. 20, 21. 



Shell thin, pellucid yellowish-white, speckled with irregular 

 opaque-white spots, and stained with blackish chestnut in the um- 

 bilicus and behind the lip ; cylindric fusiform, narrowly compressed 

 at the base, subumbilicate. Whorls 9, flatly convex, shallowly 

 grooved at the sutures. Aperture squarish-oblong, three-toothed 

 (columella bearing a subtransverse fold, two tooth-like folds rising 

 within the outer lip, the first facing the columellar tooth, the second 

 a little in advance) ; lip thin, effuse. Length 20, diam. 6 mill. 



Brazil. 



This form seems to me from the figures to be identical with 

 Bulimus parallelus Pfr., and to differ from occultus Rve. in the 

 obsolescence or small size of the lip folds. 



B. parallelus Pfr. Shell compressed-umbilicate, fusiform, rather 

 thin, striatulate, tawny, somewhat reticulated with a whitish epi- 

 dermis. Spire long-conic, obtuse ; whorls 7, moderately convex, 

 the last a little shorter than the spire, compressed at the base. 

 Columella lightly folded and twisted above. Aperture vertical, 



