186 Mr. W. T. Blanford on Lithotis rupicola. 



rus and its allies; it wants the long proboscis of Truncatella, and 

 differs in both operculum and tentacles from the minute Indian 

 shells ascribed to Hydrocena^-, which otherwise resemble it both 

 in the form of the shell and in their rocky habitat. Every cha- 

 racter of shell, operculum, and animal, with the one exception of 

 the pulmoniferous sac, admits of the position I have assigned 

 to it amongst the Littorinid<2, in the neighbourhood of Fossar 

 and Lithoglyphus. If delegated to the Pulmonifera, a new family 

 must be founded for it ; and it will certainly add to the doubts 

 of many naturalists as to the correctness of the retention of 

 two groups, so distinct in many of their characters as are the 

 Helicea and the Cychstomacea, in the same ''^ subclass" on 

 account of the identity of one particular organ. 



No question can exist as to the Western Ghats having formed 

 a marine cliff in comparatively recent geological times. Whether 

 Cremnohates be a lineal descendant of the Littorinas or Fossars 

 then inhabiting the coast may perhaps not be an unfair subject 

 for speculation. 



Fam. Helicidae. 



Sub-family Succimna. 



Genus Succinea. 



Lithotis, subg. nov. 



Testa auricxilaris, ovata, tenuis, carina longitudinali externa, 

 sulco interno correspondente prope suturam munita ; apertura 

 permagna, continua ; spira minima. 



Animal tentaculis carentibus (?), ociilis maguis in summis pe- 

 dunculis duobus retractilibus, brevibus, versus basin tumidis, po- 

 sitis : pes brevis, pyriformis, 



L. rupicola, sp. nov. 



Testa ovata, pertenuis, succinea, curvate costulato-striata ; spira 

 plana, sutura vix depressa ; anfractibus 1|-, ultimo prope aper- 

 turam descendeute ; carina ex apice oriens, spiralis, peristo- 

 matis ad marginem dextrum, 2 mm. a sutura, desinens ; aper- 

 tura permagna, ovata, continua, intus politissima, nitida ; peri- 

 stoma tenue, rectum, margine columellari callose appresso. 



Diam. maj. 7 mill., min. 5, alt. 2|. 



Sab. in montibus Syhadri cum Cremnolate Syhadrensi. 



The above are the dimensions of the largest specimen I possess. 

 This species appears to be very nearly as remarkable a link as 

 that last described; for it combines the characters of Camptonyx 



* H. 5om^a, Bens., H. pyxis, B., H. frustillum,B., &c. The oper- 

 culum has no spiral structure, being simply excentrically striated, as in 

 Helicina ; the tentacles are lobate. I propose to separate these species 

 under the generic name of Georissa. 



