ORTHALICUS. 199 



joined by a glossy whitish callus. Alt. 76, diam. 30; aperture, in- 

 side, 31 mill, long, 15 J wide (Albers). 



On the Maranon river in Colombia [now Peru], (Warscewicz). 



Bulimus maranhonensis ALB., Mafak. Blatter, i, 1854, p. 216. 

 PFR., Novit, Conch, i, p. 42, pi. 11, f. 11, 12 ; Monogr. iv, p. 370. 



Albers does not state the color of the Iip 3 but it seems from the 

 badly-colored figure to be white, shading into brown towards the 

 outer edge. The Albers collection, now I believe in the Berlin 

 museum, contains the only specimen yet put on record. 



GROUP OF O. LABEO. 



Species without spiral striation, the peristome colored, varying 

 from blackish to brown or flesh-colored, the columella folded ; exter- 

 nal coloring vivid in the species of Ecuador, rather plain in those of 

 Peru. 



Key to Species. 

 a. Peristome well reflexed (species of the Maranon drainage). 



b. Peristome reddish ; shell with broad chestnut zigzag 



streaks. shuttleworthi, p. 201 



l> 1 . Peristome and parietal wall very dark or black brown ; 



shell with narrow dark lines at periphery, base, and suture, 



and a few streaks. 



c. Lip smooth, purplish brown. vicarius, p. 200 



c 1 . Lip punctured, very brown and dark, labeo, p. 199 



a 1 . Peristome reddish-brown or pink, blunt and thickened, more or 



less expanded, but hardly reflexed ; color of arrow-shaped or 



trapezoidal spots in bands. 



b. Aperture somewhat angular at base of the columella. 



yatesi, p. 202 

 b 1 . Aperture evenly rounded beneath. kelletti, p. 204 



O. LABEO (Broderip). PL 44, figs 21, 22. 



u Shell stout, long-oval, of a brown-chestnut color, changing to 

 red at the apex and on the upper whorls, which last are longitudi- 

 nally striped with reddish-brown towards the suture. Whorls 6, 

 ventricose ; the last has a narrow black band across its middle, and 

 another of the same color close to the suture, which is white; the last 

 whorl but one has two narrow black bands, both near the sutures ; 

 the lower bands on the last and penultimate whorls are each thrice 



