322 RISSOIID^E-JEFFREYSIID^E. 



Combines the epidermis, and to a great extent the animal of Hy- 

 drobia, with the peristome of Rissoia and the operculum of Jeffrey- 

 sia. 



Genus I KAVADIA, Blanford. 1867. 



Rissoiform, the apex often obtuse, whorls spirally ribbed and 

 covered with an epidermis ; aperture ovate, margins continuous, 

 anteriorly slightly effuse, outer lip with an external varix. Oper- 

 culum and animal unknown. 



Brackish water. India. I. ORNATA, Blanford. 



Probably closely related to Fairbankia. 



Genus FENELLA, A. Adams. 1871. 



Shell turriculate, subulate, or pupoid, whorls cancellated ; aper- 

 ture oval in front, peristome interrupted, lip sharp, thickened or 

 varicose. F. PUPOIDES, A. Ad. Japan. 



Some authors place Fenella in Pyramidellid;'. 



Genus PUTILLA, A. Ad. IM1. 



Shell turbinated-conic, solid, smooth, rimate ; aperture suborbic- 

 ular, lip thickened, subeffuse in front, scarcely expanded. Relation- 

 ships obscure. P. LUCIDA, A. Adams. Japan. 



Genus SKKNELLA, Pfeffer, 1886. 



Shell depressed globose, compressed around the umbilicus ; peris- 

 tome continuous, the inner lip straight, oblique ; operculum pauci- 

 spiral, with a projecting lamina, arising from the nucleus. 



S. GEORGIANA, Pfefier. 

 South Georgia. 

 FAMILY JEFFKEYSIIDsK 



Proboscis bilobed in front, forming two sharp, narrow, ciliated 

 appendages as long as the tentacles, which are equally ciliated ; 

 eyes sessile at the base of the tentacles ; foot lanceolate. Jaws 

 scaly (PI. 54, fig. 2). Radnla variable, short, the central tooth 

 small, with slightly reflected margin, lateral tooth arcuate, some- 

 times denticulate, sometimes unarmed, marginal teeth absent or 

 present (PI. 54, fig. 1). 



Shell small, thin, transparent, with oval aperture. Operculum 

 imbricated, concentric, with marginal nucleus, the inner face with 

 a transverse carina (PL ">4, figs. 96, 97). 



