Iviii ODONTOSTOMINA:. 



Bulimuline in their main features, but differing from the Bulimulinse 

 in the wholly imperforate shell, the appendix of the penis, developed 

 in no other group of Bulimvlidse, the few broad and strongly imbri- 

 cating plaits of the jaw, and a special modification of the teeth. 



Synopsis of Genera. 



I. Early whorls pitted. 



a. Shell rather ^thin, capacious, with large, oblique aperture 

 and simple, thin or somewhat thickened lip and columella, 

 the former not expanded. Genus ORTHALICUS* 



a 1 . Shell solid, more lengthened, the aperture smaller, vertical 

 or nearly so, the lips thick and blunt, or expanded or re- 

 flexed ; columella usually with one or two folds. 



s. g. MetorthaUcus* 



II. Early whorls smooth, or with some radial wrinkles. 



a. Shell ovate-conic, usually with coloration of festooned 

 dark stripes, and three equidistant bands. Aperture rather 

 large, ovate and oblique, the lip simple and unexpanded, 

 columella straight or somewhat convex, not truncate below, 

 Vagina and spermatheca duct long. 



Genus OXYSTYLA. 



a 1 . Shell ovate-conic, solid, with ovate aperture, the lip re- 

 flexed, expanded, or merely blunt and rather thick. Vagina 

 and spematheca duct short. Genus PORPHYROBAPHE. 



a 2 . Shell oblong-conic, with simple, thin-edged, unexpanded 

 lip, the columella usually truncate below, either concave, 

 folded or straight above. Genus LIGUUS. 



b. Shell white or bright-colored, with rather small apex, 

 Antillean. s. g. Liguus* 



b l . Shell dark colored, the columella concave above, ab- 

 ruptly truncate at the base. Colombia. 



s. g. Hemibulimus* 



& 2 . Shell strong, the apex obtuse as though cut off, the 

 columella bearing a callous fold above. Colors not 

 vivid. South America. s. g. Corona. 



The genital system of the Orthalicinse (plate 55) is Bulimuline in 

 its main features, and shows no important differences in the various 

 genera. The atrium is very short. The penis bears an accessory 



