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R. MIRABILIS, Dunker ; R. PLANAXOIDES, Desm. Miocene of Aqui- 

 taine. . ..:. ! 



The group was proposed first for fossil species, but the above re- 

 cent shell, referred by Semper to a new group Isselia (preoccupied, 

 and by Nevillto Isseliella, 1885, may be included. 



Subgenus EATONIELLA, Dall. 1876. 



Smooth, aperture subcircular, peristome simple, continuous, not 

 effuse below, lip margin not thickened. Operculum paucispiral, 

 with an interior claviform process. R. KERGUELENEUSIS, Smith. 

 3 sp. Kerguelen Is. 



Name substituted for Eatonia, E. A. Smith, preoccupied. 



Genus BARLEEIA, Clark. 1855. 



Conically turbinated, whorls slightly convex, smooth; aperture 

 oval, entire, rounded in front, lip sharp. Operculum subconcentric, 

 not spiral, with lateral nucleus, and an internal rib-like processs. 



Operculigerous lobe without processes, tentacles moderate, simple, 

 obtuse at their extremity, foot a little emarginate behind, truncate 

 in front. B. RUBRA, Adams. Europe. 



Many conchologists place this group in connection with Jeffrey- 

 siidae, rather than with Rissoiidse. 



Genus KEILOSTOMA, Desh. 1848. 



Elongated, turriculate, usually spirally striate ; aperture short, 

 entire, twisted at the base, angular behind, lip very thick, exteriorly 

 varicose, laterally produced, sinuous behind. 



Cretaceous and Eocene; Europe, India. K. EXIMIA, Desh. 

 (Struct. & Syst. Conch., t. 72, f. 39.) 



On account of Chilostoma, Fitz., 1833, Bayan, in 1873, changed 

 the above name to Paryphostoma. 



Genus FAIRBANKIA, Blanford. 1868. 



Shell imperforate, turretcd, with a brown epidermis ; aperture 

 suboval, rounded in front, lip slightly dilated, with acute margin 

 and exterior varix. Operculum corneous, subannular, with an in- 

 terior long transverse rib. 



Animal with long filiform tentacles, and eyes sessile at their 

 bases ; proboscis elongated ; foot wide, sinuated in front, rounded 

 behind. F. BOMBAYANA, Blanf. Estuary; Bombay Harbor. 



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