218 CASSIDID.E. 



The thin, inflexed outer lip of Levenia at once distin- 

 guishes the genus from others in the family; the oper- 

 culum is small and very narrow, being adapted to the con- 

 tracted aperture; the shell, which is covered with a horny 

 epidermis, and the peculiar operculum, are all at present 

 known concerning the genus. 



Genus SCONSIA, Gray. 



Operculum — ? 



Shell ovately-fusiform, transversely grooved, with a 

 single longitudinal varix; spii-e acuminated; aperture 

 elongated ; canal very short, slightly recurved ; inner lip 

 regularly plicated, anterior plaits the largest; outer lip 

 thickened, subreflexed, internally plicated. 



Syn. Cassidaria sp.. Lam. 



Ex. S. striata, Lamarck, pi. 23, fig. 5. 



The texture of the shell in this genus is very peculiar, 

 being transversely striated and not tubercled, as in Ga- 

 leodea, and the canal is neither so long, nor so recurved, 

 as in that genus ; the operculum and animal are unknown. 



Genus GALEODEA, Link. 



Operculum ovate, outer edge sinuous, nucleus on the 

 hinder third of outer margin. 



Shell oval, last whorl ventricose, tuberculated ; aper- 

 ture narrow, ending anteriorly in a produced, recurved 

 canal; inner lip plicated, widely spread over the body- 

 whorl; outer lip reflected and crenate. 



Syn. Morio, Montf. Echinora, Schum. Cassidaria, 

 Lam. 



