204 helicinje. 



Sub-gen. eurvstoma, Albers. 



Shell narrowly umbilicated, depressly globose, calcareous, last 

 whorl convex at the base, deflexed ; peristome labiate, broadly 

 expanded, the columellar margin straight, dilated, almost cover- 

 ing the umbilicus. 



deflexa, Pfeiff. vittata, Mull. 



fallaciosa, Ferus. 



Sub-gen. vallonia, Pusso (Zurama, Leach. Amplexus, Brown, 

 not J. Sow. Circinaria, Beck. Corneola, Held. Chilo- 

 stoma, Fitz. Acrenellus, Agass. Glaphyra, Albers). 



Shell umbilicated, rather depressed, diaphanous; aperture 

 oblique, sub-circular ; peristome white, labiate, reflexed. 



annulata, Case. pygmsea, Say. 



costata, Miill. Tuckeri, Pfeiff. 



pulchella, Mull. 



Genus SOLAROPSIS, Beck. 



Shell umbilicated, orbiculately depressed, rather flat above, 

 convex below ; whorls regularly increasing, the last carinated 

 or obtusely angulated ; aperture lunar (in the keeled species 

 angulately lunar) ; peristome marginated, shortly reflexed, 

 columellar margin straight, dilated. 



Syn. Solarium, Spix, not Lam. Helicella, Swains., 

 not Lam. Ophiodermis, Agass. 



Ex. S. pellis-serpentis, Chemnitz, pi. 78, fig. 2. Shell, 

 S. pellis-serpentis, fig. 2, a. 



The species of this genus are from tropical America, some 

 from the north and some from the south of the equator; 



