3o6 Records of the Indian Museum. [Vol. X, 



striae ; umbone moderately large, hardly prominent, showing 

 traces of purplish colouring ; dorsal margin anteriorly , steeply slop- 

 ing, posteriorly gently so; ventral margin gently rounded; ante- 

 rior side abruptly sloping above, sharply rounded below ; posterior 

 side produced, rounded; left valve bearing two, scarcely diver- 

 gent, almost vertical, cardinal teeth, a very oblique and a little 

 projecting, posterior, cardinal tooth, and a broad, oblique, grooved, 

 anterior lateral ; inner margin of shell crenulate. 



lyong. i6 5, lat. 22-25 mm. 



Hab. — On shore at Satpara, Lake Chilka, Orissa. Probably 

 in a subfossil state. 



The author has only been able to examine a single valve (the 

 left) of this interesting species. 



dementia annandalei, sp. n. 



(Figs. 14, 14^-6, p. 305). 



Shell slightly inequilateral, convex, roundly ovate, thin, white, 

 marked with rather fine, concentric striae and coarse, flattened 

 ridges ; umbones small, not prominent, curved in an anterior direc- 

 tion ; dorsal margin arched ; ventral margin rounded ; anterior side 

 rounded; posterior side a very little produced, obtusely rounded; 

 right valve bearing three cardinal teeth of which, the anterior is 

 small and very slightly curved, the median short thick and cuneiform 

 and the posterior about double the length of the median tooth, 

 very oblique and also thickened ; the left valve also bearing three 

 cardinals of which, the anterior is short and somewhat erect, the 

 median very oblique and running at an acute angle to the ante- 

 rior, while the posterior is fine and also very oblique running again 

 at an acute angle to the median. 



Long. i6*5, lat. I7'5 mm. 



Hab. — Lake Chilka, Orissa, about three miles off Balugaon, 

 from muddy bottom at a depth of from 6 to 8 feet (Type) ; smaller 

 examples were also taken on the same bottom and at the same 

 depth at about two miles from the same locality ; between Barna- 

 kuda and Nalbano Isd., in 10 feet; off Samal Isd., Ganjam 

 District, Madras ; about half a mile east of Nalbano Isd., Orissa, 

 in from 10 to 12 feet. Port Canning, Gangetic delta {Coll. Ind. 

 Mus.). 



Family CYRENIDAE. 



Corbicula (Velorita) satparaensis, sp. n. 



(Figs. 22, 22a, p. 308). 



Shell moderately large, very solid, cardiiform, both valves 

 bearing traces of radiate transverse costulae ; umbones large, pro- 

 minent ; dorsal margin strongly arched ; ventral margin gently 



