356 



Memoirs of the Indian Museum. 



[Vol. V, 



is very low. A polychaete worm of the genus Diopatra frequently fixes a single valve 

 of the shell to the upper extremity of its tube, which projects in the form of a vertical 

 funnel above the surface of the sand. 



Family Myidae. 

 Corbula chilkaènsis ,* Preston, 1911, p. 39, fig. 2. 



This species is represented in our collection by a single specimen, the type, taken 

 living under a stone at the edge of the lake near Rambha in March, 1910. It bears 

 a remarkably close resemblance to some species of Cuspidaria. The interior of the 

 shell has not been examined and we are by no means certain of the true systematic 

 position of the species. 



Family Pholadidae. 



Mar testa striata (L,inn.), Reeve, Conch. Icon., XVIII, Pholas, pi. viii, figs. 32, 

 a, b, c. (1873). 



In the old collection of the Indian Museum there are several small and distorted 

 valves of this species, labelled " Chilka I,ake." It is a cosmopolitan form common 

 in drift-wood in the Bay of Bengal and the specimens probably came from a log 

 that had drifted into the mouth of the lake. 



Family Teredinidae. 



Xylotrya stutchburyi, Sowerby, Reeve, Conch. Icon., XX, pi. ii, figs. 5, $a, b, c 

 (1878). 



A post standing in the lake near Satpara was bored through and through by 

 this ship-worm. Many of the tubes were empty and one of them was occupied by 

 a small blenny of the genus Petroscirtes ; some were lined by the Polyzoon Mem- 

 branipora hippopus. 



Order DIBRANCHIA. 



Family Tellinidae. 



We obtained no living representatives of this family; but the shells of the 

 following two species were apparently quite fresh at the time they were collected. 



Tellina chilkaènsis * Preston, 1915, p. 306, figs. 20, 20a, 206. 

 A single pair of fresh valves was obtained in the inner part of the outer channel 

 in the freshwater season. 



Tellina confusa* Preston, 1914, p. 309, figs. 18, 18a. 



We obtained no specimens of this species, which has long been represented in 

 the Indian Museum by examples from the late Dr. Blanford's collection, labelled 

 T. aequistriata , Sowerby. They are probably from the outer channel of the lake. 



Family Scrobiculariidae. 



Theora opalina (Hinds), Proc. Zool. Soc. London, 1843, p. y8. 

 This is quite the most abundant bivalve mollusc in the main area of the lake. 

 It occurs more sparingly in the inner part of the outer channel. The shell lies buried 



