238 RHODEA. 



fugacious corneous-gray cuticle. Spire many-whorled, 

 slowly tapering, the summit rather obtuse, nucleus hyaline 

 and denuded; suture linear. Whorls 14, very slowly in- 

 creasing, the first glossy, a little convex, parted by an im- 

 pressed suture, the following whorls flat, separated by a 

 linear or thread-margined suture ; last whorl concavely con- 

 tracted, encircled by a very erect, acute keel, excavated at 

 the base, with a second carina revolving obliquely around the 

 umbilical region. Aperture rather oblique (at 40 degrees 

 with the axis), one-seventh the length, triangular, one angle 

 at the protracted insertion of the outer lip, the second a right 

 angle at the periphery, the third 'angle at the subvertical, 

 twisted, truncate columella. Peristome rather obtuse, nar- 

 rowly expanded, a trifle reflexed; the oblique upper right 

 margin is straight, concave forwardly near the carina; the 

 lower or basal margin is straight and horizontal, joining the 

 columella at an angle of 50 degrees; columellar margin nar- 

 rowly reflexed, partly free below the carina. Length 56, 

 diam, of last whorl 10, at carina 14 mm. (Mouss.). 



Colombia: Bogota (Wallis) ; Sonson in the prov. Antio- 

 quia, and in the Cauca Valley. 



Rhodea gigantea Mouss., Malak. Bl. xxi, 1873, p. 15. 

 PFR., Novit. Conch, p. 119, pi. 127, f. 10, 11; Monogr. viii, 

 p. 253. KOBELT, Jahrb. d. D. Malak. Gtes. ii, 1875, p. 222, 

 pi. 6, f. 5. CROSSE, Journ. de Conch, xxiv, 1876, p. 18, pi. 

 1, f. 2. DA COSTA, Proe. Malac. Soc. Lond. iii, p. 305, figs, 

 i, ii. 



6. R. COUSINI Jousseaume. PI. 38, fig. 16. 



Shell narrowly and very deeply umbilicate, worm-shaped, 

 collared anteriorly with an acute spiral keel, rather thin, 

 corneous-buff, obliquely wavy striate, the apex smooth, ob^- 

 tusely conoid. Whorls 14, the first a little convex, the fol- 

 lowing ones flat, the rest excavated, parted by a straight 

 carina at the suture, this carina median on the last whorl, 

 which is excavated below it. Aperture suboblique, triangu- 

 lar, margin simple, columella thickened, arcuate, reaching 

 to the base, forming a channel with the basal margin. 



