310 DRYM.EUS, SOUTH AMERICAN. 



spire is straigbtly conic, aperture always decidedly less than half the 

 length of the shell, and the lip either very slightly expanded or not 

 perceptibly so. D. sulphureus Pfr. from Mexico has a larger aper- 

 ture, but is closely allied to virginalis. The Mexican localities 

 given by some authors for virginalis are probably based upon the 

 closely allied D. sulphureus, as von Martens believes. 



D. virginalis has also been reported from Dominica by A. D. 

 Brown. See under Antillean species. 



D. ELECTRUM (Reeve). PI. 41, fig. 36. 



Shell perforate, ovate-oblong, thin, striatulate, seen under the 

 lens to be sculptured with close spiral lines ; diaphanous, pale buff. 

 Spire convex-conic, the apex subacute. Whorls 5 2, rather flat, the 

 last a little longer than the spire, rotund at base. Columella thin, 

 lightly arcuate. Aperture oblique, oblong-oval ; peristome simple, 

 the right margin narrowly expanded, columellar margin dilated 

 above, reflexed, flat, subappressed. Alt. 30, diam. 12 mill.; apert. 

 16 mill, long, 9 wide. (Pfr.'). 



Venezuela (Cuming coll.). 



Bulimus electrum REEVE, Conch. Icon., pi. 56, f. 373 (Dec., 1848). 

 PFR., Monogr., iii, p. 337. 



" A delicate, transparent shell of somewhat glassy texture, dis- 

 tinguished by its bright amber color." 



D. TENUILABRIS (Pfeiffer). 



Shell profoundly umbilicate, ovate-turrited, thin, smoothish (under 

 the lens minutely spirally striated), shining ; alabastrine ; spire tur- 

 rited, the apex acute ; whorls 7, rather flattened, the last shorter 

 than the spire, slightly ascending in front, compressed-rotund at 

 base. Aperture slightly oblique, truncate-oblong ; peristome simple, 

 the right margin narrowly expanded, columellar margin much 

 dilated as far as the base. Alt. 30, diam. 12 mill. ; aperture with 

 peristome 14z mill, long, 10 wide. (Pfr.). 



Venezuela (Cuming coll.) ; Lower Magdalena (Mouss.). 



Bulimus tenuilabris PFR., P. Z. S., 1865, p. 831 ; Monogr., vi, p. 

 50. Mouss., Malak. BL, xvi, 1869, p. 177. 



D. FLAVIDUS (Menke). PI. 26, figs. 71, 72, 73. 



Shell ovate-acute, subperforate, thin, yellow, the suture white 

 margined. Length 10 lines. Var. a, yellow throughout. Var. b, 



reddish below (Mke.). 



Caracas, Venezuela (Lansberg, Gollmer). 



