8CAPH AM.IMI. .1 . 



Synopsis of G> //<?</. 



Genus SCAPHANDER Montfort. 



Shell involute, oblong or ovate, the spire concealed by a callu-, 

 covered with a thin epidermis, spirally striated. Aperture as long 

 as the shell, narrow above, much dilated below, the colurnellar lip 

 concave, long; columella revolving around a hollow axis; parietal 

 wall smooth. 



Subgenus SABATIA Bellardi. 



Shell like Scaphander, but parietal wall bearing an entering fold 

 of callus. 



Genus SMARAGDINELLA Adams. 



Shell ovate, entirely open from the front and base ; whorls hardly 

 more than one ; apex concealed ; aperture nearly as large as the 

 shell, ovate ; parietal wall bearing a large spirally entering plate, 

 forming a little cup projecting into the aperture. 



Subgeuus NONA H. & A. Ad. 



Shell white, the outer lip rising well above the vertex. 

 Genus ATYS Montfort. 



Shell solid, involute, oval, usually with spiral stria? at both ends; 

 aperture projecting beyond vertex and base, the lip typically folded 

 above the vertex ; columella plicate or concave, generally partly re- 

 flexed over a small umbilicus. See text for subgenera. 



Genus CYLICHNA Lovi'n. 



Shell rather small and subcylindrical, the spire sunken and um- 

 bilicate or closed by a callus from the inner lip : rather solid ; aper- 

 ture as long as the shell, narrow 7 above, somewhat dilated bel<>\\ ; 

 columella short, thickened, sometimes sinuous. For subdivisonssee 

 text. 



Genus DIAPHANA Brown. 



Shell small, thin, corneous-brown, umbiHcated, swollen, tin- la>t 

 whorl shouldered or globose; spire low or sunken in an apical um- 

 bilicus. Aperture as long as the shell. ri-in^ r above the vertex ; 

 peristome thin. For subdivisions see text. 



