DRYM^EUS, SOUTH AMERICAN. 239 



brown callus ; columella short and straight. Alt. 22, diam. 12, aper- 

 ture 11 mill. long. (Pfr.). 



Province of Bogota, Colombia, (Goudot, Wallis). 



Bulimus subsemidausus PETIT, Revue Zool., 1843, p. 239 ; Guer- 

 in's Mag. de Zool., 1843, pl.66. PFR., Monogr.,ii,p.l70. REEVE, 

 Conch. Icon., pi. 41, f. 254. MOUSSON, Mai. Bl., xxi, p. 12. B. 

 (Semiclausaria) subsemidausus PER., Mai. Bl., 1855, p. 



Mousson correctly locates this species next to D. fallax Pfr. 

 Petit's original figure shows a white shell with orange apex and 

 orange-brown parietal wall. Reeve figures a specimen with several 

 spiral bands. 



D. RABUTI (Jousseaume). PI. 33, fig. 47. 



Shell scarcely rimate, obliquely ovate-triangular, rather solid, 

 ornamented with slight striae, strong at the aperture ; ivory or 

 buff white, densely variegated with red spots; spire conic, the apex 

 somewhat acute ; whorls 5, a little convex, the last ample, swollen, 

 somewhat inflated. Aperture ovate-subtriangular ; peristome ex- 

 panded, black-lipped within. Alt. 25, greatest diam. 18, least 13 

 mill., length of aperture 12, width 9 mill. (Jouss."). 



Tena, Ecuador (Cousin). 



Hamadryas rabuti Jouss., Le Naturaliste, xx, Jan., 1898, p. 14, 

 figs, in text. 



D. FALLAX (Pfeiffer). PI. 33, figs. 43, 44 ; pi. 28, figs. 8, 9, 10. 



Shell subperforate, ovate-conic thin, bluish-white with some 

 opaque white clouds, becoming generally diffused behind the per- 

 istome, and with an opaque white subsutural margin (or yellow with 

 a white sutural line, or whitish with spots and longitudinal lines of 

 fawn). Smoothish, under a lens finely wrinkled and pitted; shin- 

 ing. Spire short. Whorls 5J-6, slightly convex, the last large, in- 

 flated, obliquely produced, becoming conspicuously keeled at the base 

 a short distance behind the lip, the keel projecting, bounded by a 

 furrow above ; base at first inflated, then becoming flattened and radi- 

 ally plicate behind the basal lip. 



Aperture subvertical, subtriangular ; peristome narrowly but dis- 

 tinctly expanded, thickened within, white or rose-bordered, produced 

 and angular at junction of outer and basal margins ; baso-columellar 



