302 DRYMJSUS, SOUTH AMERICAN. 



ornamented with irregular brownish streaks not extending below 

 the middle of the last whorl ; spire convex-conic, acute. Whorls 

 (i, scarcely convex, the last slightly longer than the spire, attenuated 

 at base ; columella thread-like, receding. Aperture little oblique, 

 oblong-oval ; peristome simple, the right margin lightly arcuate, a 

 little expanded, columellar margin dilated above, subappressed. 

 Alt. 33, diam. 12 mill.; aperture 17 mill. long. (Pfr.). 



Venezuela (Rve.) ; New Granada (Miiller) ; Amazonas (Mouss.). 



Bulimus roseatus REEVE, Conch. Icon., pi. 54, f. 353 (Dec., 

 1848). PFR., Conchyl. Cab., p. 246, pi. 66, f. 3, 4 ; Monogr., iii, 

 p. 336 ; viii, p. 61. MOUSSON, Malak. Bl., xvi, 1869, p. 76. Otos- 

 tomus roseatux MARTENS, Die Binnenmoll. Venez., p. 186* ? Lio- 

 stracus roseatus JOUSSEAUME, Mem. Soc. Zool. France, ii, 1889, p. 

 242 (Tovar, Venezuela). 



Similar in coloring to D. oreades Orb. 



D. LACTEUS (Lea). PI. 45, figs. 38, 39. 



Shell oblong-turrited, minutely rimate, thin ; milky ivhite, with a 

 single brown band encircling the umbilical chink, and usually some 

 irregular bluish or reddish blotch-like longitudinal streaks (overlaid 

 irith white), subvertical, or somewhat oblique in a direction opposed 

 to that of the growth stride, and not extending below the periphery on 

 the last whorl; the base more translucent. Surface glossy, with faint 

 growth-lines and close, fine, superficial incised spiral lines through- 

 out. Spire long, conic, the apex rather obtuse ; whorls 7, slightly 

 convex, the earlier If with typical Drymceus sculpture, last whorl 

 rounded or faintly angular at the periphery. 



Aperture oblique, ovate, white inside, and showing the external 

 markings, its length contained more than 2% times in that of the 

 shell ; peristome thin, its edge the merest trifle expanded ; columella 

 vertical, with a convex fold above, the margin triangularly dilated 

 and reflexed above. 



Alt. 27, diam. 11 '7 ; length of aperture 10'3 mill. 



Alt. 27, diam 12; length of aperture 11 mill. 



Colombia, about 100 miles up the ]\fagdalena River (T. R. Peale). 



Bulimus lacteus LEA, Trans. Amer. Philos. Soc., vi, p. 65, pi. 23, 

 f. 100; Obs. Gen. Unio, ii, p. 65, pi. 23, f. 100- PFR., Monogr., ii, 

 p. 169. 



Lea's type was immature. The peculiar streaks described above 

 are sometimes so faint that in the absence of more boldly marked 



