.'U(J RISSOIID^. 



Section Persepiiona (Leach, 1852), Monts 1884. 



Originally iucluded a heterogeneous assemblage of species of 

 various types. Monterosato has recently restricted it to those 

 having punctate spiral lines; either longitudinally ribbed or sm()Oth. 



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. 



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

 margin of aperture dilated or reflected. 



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



Section Turbp:lla, 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, DaC'osta. 



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

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

 R. pusUla,V\ul. 



? Section Mohrenstj:rnia, Stoliczka. 1 868. 



Turriculated, thin, semipellucid; whorls frequently transvers^ely 

 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. INFLATA, Andrzejowski. Eastern Europe. 



Section Manzonia, Brusina. 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 SABANii':A, Leach. 1847. 



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



R. FLAMMEA, Fraucuf 



1 



