244 melampintE. 



Genus TRALIA, Gray. 



Foot posteriorly acute, entire. 



Shell ovate, smooth; spire elevated; aperture narrow, 

 linear, dilated anteriorly ; inner lip usually with three oblique 

 plaits ; outer lip acute, sinuated posteriorly, internally with 

 one or more transverse elevated ridges. 



Ex. T. pusilla, Gmelin, pi. 82, fig. 8. 



This group, which appears to have a simple, undivided 

 tail, is chiefly obtained from the West Indian Islands, and 

 perhaps, when the animals are better known, will be found 

 to be merely a sub-genus of Melanqms. 



Species of Tralia. 



infrequens, C. B. Adams. Panamensis, 0. B. Adams. 



mitralis, H. and A. Adams. pellucida, Cooper. 



nitidula, H. and A. Adams. pusilla, Gmel. 

 olivula, Moric. 



Sub-gen. pira, H. and A. Adams. 



Shell ovate, smooth ; spire elevated ; aperture narrow, linear ; 

 columella usually with three anterior plaits ; outer lip internally 

 with numerous, elevated, transverse ridges. 



Adamsiana, Pfeiff. fasciata, Chem. 



angiostoma, Desh. Ktisteri, Krams. 



Cumingiana, Recluz. 



