112 HELICELLINiE. 



Sub-gen. pseudobalea, Shuttleworth. 

 Shell rimate or imperforate, sometimes siuistrorsal. 

 Dominiceusis, Pfeiff. 







Sub-fam. HELICELLIN^. 



Mantle-margin included. 



Shell discoidal or trochiform, umbilicated, usually thin, 

 many-whorled ; peristome straight, acute. 



Genus SAGDA, Beck. 



Shell imperforate, globosely-conoidal ; whorls 8 9, the 

 last sub-angulated, lamellate within ; columella short, oblique, 

 dilated at the base; aperture depressed, lunar; peristome 

 simple, acute. 



Ex. S. gularis, Say, pi. 71, fig. 4. Shell, S. epistylium, 

 Mil Her, fig. 4, a. 



Sagda, remarkable for the number of its whorls and the 

 lamina in the mouth, comprises but a few species ; they are 

 from the Island of Jamaica. The North American States, 

 viz. Vermont, Massachusetts, and Pensylvania, harbour the 

 species of Gastrodonta. 



Species of Sagda. 



alligans, C. B. Adams. epistylium, Mull. 



connectans, C. B. Adams. epistyloides, Ferns. 



Cookiana, Gmel. Foremaniaua, C. B. Adams. 



epistyliolum, C. B. Adams. lamellifera, G. B. Adams. 



