^6 Mr. J. C. Melvill and Mr. Abercrombie on 



Iravadia (W. T. Blanford). 



/. trochlearis (Gould). 



Fenella (H. and A. Ad.). 



F. cerithina (Phil.). 



Fairbankia (W. T. Blanford). 



F. Bombayana (Blanford). 



We have named Rissoina canaliculata (Sch.) from speci- 

 mens so labelled in the National Collection, S. Kensington, 

 but we are doubtful whether the R. ainhigua 3.x\d plicatula, of 

 Nevill's Catalogue, could we but examine the types now in the 

 Calcutta Museum, would not clear up some difficulties with 

 regard to them. /. trocJilearis (Gould) is a beautiful white 

 tranversely sulcated little species, not uncommon in shell 

 sand ; the sculpture of R. insolita (Desh.), is very curious. 

 Other specimens of this genus we have at present unnamed, 

 owing to the difficulty attending the synonyms throughout, 

 and the want of a good monograph of the whole order. 



Fam. HydrobiiD/E. 



Stenotiiyra (Bern.). 



6". Woodmasoniana (Nevill). 

 5. sp. 



We have two, if not three, species of this closely-allied 

 genus. 



Fam. AssiMlNEIDiE. 



Assiminea (Leach). 



A. cornea (Leith). 



Very small and obscure brackish water species ; we have 

 about three or four species altogether, but have not been 

 able to differentiate them with absolute certainty, not 

 having seen the named types. They will probably fall 

 under the following names : — 



A. Bombayana (Grateloup). 



A. marginata (Leith). 



A. subconica (Leith). 



A. rotunda (Blanford). 



