316 RISSOTID.E. 



Section PERSEPHONA (Leach, 1852), Monts 1884. 



Originally included a heterogeneous assemblage of species of 

 various types. Monterosato has recently restricted it to those 

 having punctate spiral lines; either longitudinally ribbed or smooth. 



R. RUFILABRIS, Leach. 



This group shades unmistakably into the typical one. 



Section SCHWARTZIA, Bucq. Dautz. et Dollf. 1884. 



Shell elongated, conic, longitudinally ribbed or smooth, colum- 

 ella dentate. R. MONODONTA, Bivona. 



Section ZIPPORA, Leach. 1847. 



Claubilia-like, generally elate, smoothish or longitudinally ribbed ; 

 margin of aperture dilated or reflected. 



Acme, H. & A. Adams, is a synonym. R. AURISCALPIUM, Linn. 



Section TURBELLA, Leach. 1847. 



Shell ovate, minute, often flamed or maculate with chestnut, with 

 rounded longitudinal ribs, becoming obsolete on lower part of body 

 whorl, or sometimes smooth, no spiral striae. R. PARVA, DaCosta. 



Pusillina, Monts., 1884, may be united with this section. Whorls 

 turriculated, ribs interrupted, lip acute, not externally varicose. 

 R. pusilla, Phil. 



? Section MOHRENST ERNIA, Stoliczka. 1868. 



Turriculated, thin, semipellucid ; whorls frequently transversely 

 costulate ; columella fissured at the base ; aperture subovate, angu- 

 lated behind, rounded in front, margin very little dilated, outer lip 

 simple, scarcely varicose. Fossil in brackish or fresh-water de- 

 posits, R. i NFL AT A, Andrzejowski. Eastern Europe. 



Section MAN/ONI A, Brasilia. 1870. 



Shell more or less shouldered, longitudinally ribbed, spirally 

 ridged, peristome duplicate. European. R. COSTATA, Ads. 



Flemingia, Jeffreys, 1884, is a synonym. 

 Section FOLINIA, Crosse. 1868. 



Turriculated, longitudinally ribbed, spirally striate, posterior end 

 of aperture with a small sinus. R. INSIGNIS, Folin. Panama. 



Subgenus SABAN^A, Leach. 1847. 



Shell smooth, stout, elevated conic, peristome thick, continuous. 



, R. FLAMMEA, Fraueiif. 



