DRYM^EUS, SOUTH AMERICAN. 313 



D. GRATUS (Pfeiffer). 



Shell shortly rimate, subperforate, obloDg-turrited, solid, nearly 

 smooth, little shining, yellow-whitish ; spire lengthened, somewhat 

 convexly turrited, the apex corneus. rather acute. Whorls 7, 

 slightly convex, the last forming three- sevenths the total length, 

 somewhat compressed basally. Columella straightened, receding. 

 Aperture a little oblique, oblong-oval ; peristome unexpanded, 

 acute, the right margin lightly arcuate, columellar margin abruptly 

 reflexed, flat. Alt. 28, diam. 11?, alt. of aperture 13, width 6 1 

 mill. (Pfr.). 



Colombia (Cuming coll). 



Bulimus columbiensis PFR., P. Z. S., 1854, p. 124 (not of Lea). 

 Bulimus (Mesembrinus') gratus PFR., Malak. Bl., 1855, p. 159. 



D. AMANDUS (Pfeiffer). PI. 26, fig. 76. 



Shell narrowly perforate, oblong-conic, thin, nearly smooth (under 

 the lens seem to be very finely spirally striated), diaphanous, very 

 pale rose-colored. Spire long-conic, rather acute. Whorls 6, a little 

 convex, the last a little shorter than the spire, obsoletely angled 

 below the middle, slightly attenuated at base. Columella arcuate, 

 compressed. Aperture oblique, angular-oval, the peristome simple, 

 unexpanded, acute ; columellar margin narrowly and abruptly re- 

 flexed. Alt. 30, diam. 11* ; aperture, alt. 14, width 8 mill. (Pfr.). 



Venezuela (Cuming coll.). 



Bulimus amandus PFR., P. Z. S., 1855, p. 96, pi. 31, f. 4 ; Monogr., 

 iv, p. 481. 



Section Stenostylux Pilsbry, 1898. 



Stenostylus PILS., this volume, p. 184 (May, 1898). 



Shell similar in the thread-like columella to Eudioptus, but with 

 wrinkled surface, opaque, variegated coloring, and the apical sculp- 

 ture of Drymceus. Type D. nigrolimbatus Pfr. 



Distribution, Andean region, Peru to Colombia. 



The slender columella and system of coloring have caused syste- 

 matists to group these species in Plectostylus, but they differ from 

 that Chilian subgenus in having the apical sculpture of Drymceus. 

 Eudioptus proves to belong in or near Simpulopsis, and is, therefore, 

 not allied to these species. 



Simpulopsis fulgurata of Miller has some resemblance to these 

 forms, but may be a very young Eurytus. 



