TITYS. 



113 



osculans, C. B. Adams. 

 pila, C. B. Adams. 



torrefacta, C.B. Adam*. 



Sub-gen. gastrodonta, Albers (Janulus, Lowe). 



Shell orbiculately convex, rugosely striated, sub-perforate, or 

 umbilicated ; aperture with pliciform teeth at the base ; peri- 

 stome simple, acute. 



bifrons, Lowe. 

 cultrata, Gould. 

 ex.xquata, Goidd. 

 gularis, Say. 

 interna, Say. 



lasmodon, Phillips. 

 liueata, Say. 

 macileuta, Shuttl. 

 multidenta, Gould. 

 stephanophora, Desk. 



Genus PITYS, Beck. 



Shell umbilicate, very rarely sub-perforate, depressed, dis- 

 coidal, or orbiculately convex ; whorls generally narrow ; 

 aperture lunate, usually angulated, rarely rounded ; inner lip 

 lamellate, sometimes the basal margin likewise lamellately 

 dentate; peristome straight, acute. 



Syn. Laoma, Gray. Entodonta, Albers. 



Ex. P. lamellosa, Ferussac, pi. 71, fig. 5. 



The geographical locality of this group is in all the is- 

 lands of the Pacific Ocean, Tahiti, Opara, the Sandwich 

 Islands, &c. 



Species of Pitys. 



bilamellata, Pfeiff. 

 bursatella, Gould. 

 cavernula, Homb. and Jacq. 

 contorta, Ferus. 

 dcedalea, Gould. 

 Ilelenensis, Forbes. 



hystrix, Migh. 

 Jaquinoti, Pfeiff. 

 jugosa, Migh. 

 lamellosa, Ferus. 

 Leimonias, Gray. 

 obolus, Gould. 



