1'36 AMERICAN JOURNAL 



This genus, together with the others comprising the subfamily, 

 is of South American origin. In the northern part of that con- 

 tinent, the species are numerous, but one only inhabits the West 

 Indies and the circumjacent North American coast. The 

 Orthalicus zebra, distinguished by all American authors from 

 the uiidatiis, is scarcel}'^ even a variety of it, "while the true 0. 

 zebra of Miiller, a very different shell, inhabits the western 

 parts of South America. 



1. Orthalicus undatus, Ferussac. 



Plate 13, figures 1, 2, 3. 



Shell subconical, striated by growtli lines, thick ; spire ele- 

 vated, suture moderate, slightly crenated ; whorls 6, convex, 

 the last about two-thirds of the total length of the shell ; 

 aperture large, ovate. White, with longitudinal undulated or 

 zig-zag chocolate-colored flames, intersected by three narrow 

 revolving lines of the same color ; inner surface marked the 

 same as the external. 



Length 45, diam. 27 mill. 



Southern Florida. 



BULIMULINiE. 



All the genera of this subfamily are of South American origin, 

 and only a few species of them extend into the subjacent parts 

 of North America. 



1. Drym^us, Albers. Elongate-conical, perforate or rimate, 



thin, diaphanous, variegated ; aperture large, oblong ovate, 

 columella more or less twisted, peristome thin, expanded, 

 columellar margin reflexed. 



2. LiOSTRACUS, Albers. Oblong-conical, perforate, thin, 

 smooth, fasciate ; aperture obliquely semi-oval, lip thin, 

 more or less expanded, the columellar margin dilated, 

 reflexed. 



