310 Records of the Indian Museum. [Vol. X, 19 14.] 



Family SCROBICULARIIDAE. 

 Thcora opalina, Hinds, 



Proc. Zool. Soc, London, 1843, p. yd>, as Neoera. 



About two miles off Balugaon, Orissa, on muddy bottom in 

 from 6 to 8 feet; off Satpara, Orissa, in from 4 to 6 feet ; off Sa- 

 mal Isd., Ganjam District, Madras, in from 8 to 10 feet ; between 

 Barnakuda and Nalbano Isd., Lake Chilka, in ' 10 feet (Dr. N. 

 Annandale). Port Canning, Gangetic Delta (W. T. Blanford). 



Sub- Order ANATINACEA. 



Family LYONSIIDAE. 

 Lyonsia samalinsulac, sp. n. 



(Figs. 16, 16a, p. 305). 



Shell small, thin, elongately ovate, posteriorly gaping, whitish 

 tinged, especially anteriorly, with reddish orange; umbones of 

 moderate size, not prominent, obliquely angled in a transverse 

 direction ; both valves of a somewhat coarsely granular texture 

 and marked with coarse, concentric plications especially on the 

 left valve ; dorsal margin very slightly sloping anteriorly, more 

 rapidly sloping and membranaceous posteriorly ; ventral margin 

 very gently curved; anterior side abruptly rounded; posterior 

 side produced, roundedly acuminate, with membranaceous margin. 



Long. 6*25, lat. 12*75 mm. 



Hab. — Off Samal Isd., Ganjam District, Madras, in from 8 to 

 15 feet (Type) ; between Barnakuda and Nalbano Isd., in 10 feet ; 

 Manikpatna, Orissa, in 4 feet, young specimens only taken at this 

 locality. 



Family ANATINIDAE. 



Anatina granulosa, sp. n. 



(Figs. 17, lya, p. 305). 



Shell rather small, a little gaping posteriorly, thin, whitish, 

 with the exception of the umbonal region where considerable ero- 

 sion has taken place and the extreme posterior side, granular in 

 texture and marked with fine radiate striae, posterior portion 

 coarsely, concentrically laminiferous; umbones rather small, flat- 

 tened ; dorsal margin sloping posteriorly ; ventral margin very 

 gently rounded ; anterior side sloping above, rounded below ; poste- 

 rior side very bluntly rostrate ; projecting hinge plate in valve 

 bearing two small, fine teeth ; palleal sinus very broad. 



Long. II, lat. i8'75 mm. 



Hab.— Lake Chilka {Coll. Ind. Mus.). 



