304 Records of the Indian Museum. [Voi.. X, 



Class LAMELLIBRANCHIA. 



Sub-Order MYTILACEA. 

 Family MYTILIDAE. 



Modiola undulata (Dkr.). 



Proc, Zool. Soc, London, 1856^ p. 363. 



Between Barnakiida and Nalbano Isd., in 10 feet. 



var. crassicostata, var. n. 

 (Fig. 15, p. 305). 



Shell differing from the typical form in being anteriorly and 

 posteriorly coarsely costate, 



Ivong. 5*75, lat. i2'5 mm. 



Hab. — Off Samal Island, Lake Chilka Oanjam District, Mad- 

 ras (Type) ; Breakfast Isd., Ganjam District, on rocks. 



Modiola emarginata, Bens. 



Reeve, Con. Icon. Modiola sp. 60, pi. x, fig. 73, vol. x, 1858. 

 Lake Chilka {ex. coll. W. T. Blanford). 



Sub-Order ARC ACE A. 



Family iVRCIDAE. 



Area granosa, Lin. 



Linnseus, Syst. Nat,, p. 1142. 



On shore near Rambha, Ganjam District, Madras; off Samal 

 Isd., in from 8 to 15 feet (a single valve). 



Sub-Order CONCH ACE A. 



Family VENERIDAE. 



Meroe chilkaensis, sp. n. 



(Figs. 13, 13a, p. 305). 



Shell ovate, concentrically striate and transversely, finely 

 costulate; umbone small; dorsal margin anteriorly gently arched, 

 posteriorly sloping ; ventral margin rounded ; anterior side steeply 

 sloping above, acuminately rounded below ; posterior side angled 

 above, roundly sloping below ; right valve bearing three cardinal 

 teeth of which the anterior is nearly vertical and moderately fine, 

 the median oblique and coarse and the posterior very oblique, fine 

 and elongate, and a fine anterior oblique lateral tooth. 



