STROPHOCHEILUS-THAUMASTU8. 49 



Fer., Hist, ii, p. 32. PFR., Monogr. ii, p. 141 ; Conchyl. Cab. p. 

 220, pi. 61, f. 3, 4. HIDALGO, Viaje al Pacifico p. 66. B. taunaysii 

 ORB., Toy. dans 1'Amer. Merid. p. 294. ? ? Helix ( Cochlostyla) 

 pullata FER., Tabl. Syst., p. 48 (no description). 



This species is very closely allied to S. magnifieus but it is lighter 

 colored, more roughly sculptured, the sutural margination is con- 

 stant, and the peripheral light girdle, distinct in the young, is gener- 

 ally not visible in adult shells. Still, I doubt whether they can 

 ultimately be held distinct species. 



S. ASCENDENS Pfeiffer. PI. 25, fig. 80. 



Shell imperforate, ovate-oblong, solid ; irregularly striated and 

 obsoletely decussated with spiral impressed lines ; but little shining ; 

 tawny, with a few chestnut streaks. Spire lengthened, convex, the 

 apex obtuse ; suture simple. Whorls 7 to 8, the earlier flat, follow- 

 ing a little convex, the last three-sevenths the shell's length, rounded, 

 somewhat ascending in front. Columella white, subvertical, lightly 

 folded above. Aperture vertical, narrow, subelliptical. whitish in- 

 side ; peristome slightly thickened, straight. Alt. 95, diam. 34 ; 

 aperture, alt. 41, width in the middle inside 18 mill. (Pfr.). 



.#ra2i7(CumingColl.). 



Bulimus ascendens PFR., P. Z. S., 1852, p. 136 ; Monogr. iii,378 ; 

 Conchyl. Cab., p. 247, pi. 66, f. 7. 



I have not seen this species, which seems to differ from S. taunaisii 

 mainly in its more lengthened form and the different form of the 

 columella. Like S. taunaisii, it seems to lose the apical whorls. 



S. PLUMBEUS Pfeiffer. Unfigured. 



Shell imperforate, oblong, solid, malleated with oblique impres- 

 sions, streaked and k flammulate with reddish under an olivaceous 

 cuticle. Spire convex-conic, apex blackish, rather obtuse ; suture 

 subcrenulated. Whorls 6, scarcely convex, the last a little shorter 

 than the spire, somewhat ascending in front, the base attenuated ; 

 columella lightly folded, bluish-white. Aperture scarcely oblique, 

 semioval, livid-black inside, with a pearly luster. Peristome black- 

 ish-leaden, thickened and narrowly reflexed. Alt. 93, diam. 36 

 mill.; aperture, inside, 43 mill, long, 16 wide (Pfr.}. 



Venezuela (Mus. Cuming) ; Lower^$piwMi n/ thg^Magdalena River 

 (Wallis). 



4 (UNIVERSITY 



