190 HELICINJK. 



Genus eurycratera, Beck. 



Shell umbilieate or imperforate, thin, vesical, or obliquely 

 ovate; whorls very rapidly increasing, the last large, in- 

 flated; aperture ample, oblique, lunately oblong; peristome 

 simple or somewhat thickened, the margins joiued by a 

 generally thin callus, the columellar dilated and reflexed. 



Syn. Helicophanta, Beck, not Fetus. 



Ex. E. cornu-gigauteum, Chemnitz, pi. 77, fig- 4. 



The species of Eurycratera, as restricted, are natives 

 of Madagascar and Southern Africa, Australia, and New 

 Holland. Leiostoma is an inhabitant of Jamaica, and the 

 geographical distribution of Polymita is among the West * 

 Indies, viz. Cuba, Portorico, and St. Thomas. 



Species of Eurycratera. 



ampulla, Bens. Goudotiana, Ferns. 



cornu-gigauteum, Cliem. Maconelli, Beeve. 



ecbinophora, Ferus. magnifica, Ferns. 



Falconari, Beeve. oviformis, Gratel. 



Sub-gen. leiostoma, Swainson (Leiocheila, Albers). 



Shell imperforate, sub-globose, solid; spire short, obtuse, last 

 whorl rapidly intumescent ; aperture wide ; columella arcuated, 

 widely callous ; peristome thickened, expanded or patulous ; 

 apertural paries covered with a shining callus. 



Jamaieensis, Chem. 



