196 ORTHALICUS. 



conspicuous, and more or less spaced. The color of the third whorl 

 is formed of two zones of about the same width ; the anterior one yel- 

 lowish with brown spots behind, the posterior one white with quite 

 large, spaced chesnut-brown spots; on the following two whorls there 

 are waved lines of light chestnut on a yellowish ground, and occa- 

 sional very irregular long spots of deep brown. The last whorl, 

 which is a little ventricose, is of a dead-leaf color, ornamented with 

 four revolving zones of very pale green, the anterior three wide and 

 closer together than to the narrower posterior zone. 



The locality in Ecuador of the original specimen was not known, 

 but Dr. Wolf collected two specimens at the locality given above. 

 One of them is very similar to the type in coloration, but the other, 

 agreeing with the type in form and size, the coloration of the aper- 

 ture, lips and columella, has four alternating narrow and broad bands 

 composed of spots shaped like long, pointed scales. This is more 

 like 0. fraseri, and is considered by Herr Reibisch to be a more 

 normal coloration than that of the type. 



GROUP OF O. DEBURGHI.I:. 



The shell is smoothish with fine and rather shallow spiral striation, 

 a pure white aperture and strongly-folded columella. 0. deburghice 

 is not an uncommon shell, but wrzesniowskii is as difficult to get as 

 its name is to pronounce, and maranhonensis is still known by .the 

 type 'specimen only. 



Key to species. 



a. Shell with numerous broad dark stripes separated by narrow 

 zigzag yellow stripes, a wide subsutural zone paler; the per- 

 iphery and a small basal tract encircled by interrupted blackish 

 lines. deburgldce, p. 196. 



a 1 . Shell flesh-tinted, with narrow brown streaks and dull lilac 

 dots ; aperture over half the total length, wrzesm'uivskii, p. 198. 

 a 2 . Shell tawny, with livid clouds and irregular blackish streaks 

 and spots ; aperture less than half the total length. 



maranhonensis, p. 198. 



O. DEBURGHI^ (Reeve). PI. 39, figs. 3, 5 ; pi. 42, figs. 9, 10, 11, 

 Shell ovate-conic, thick and solid. Pale yellow (white when de- 

 nuded of the thin cuticle), with broad, zig-zag, blackish-olive (or 

 when denuded, purplish-black) stripes which abruptly cease at the 



