igoS.] Records of the Indian Musenin. 207 



Tapes alho marginal a, sp. no v. 



Shell ovate, flesh coloured, obsoletely raj^ed with purple, 

 ■sculptured with regular, prominent, raised lirse ; anterior side 

 somewhat angularly rounded ; posterior side almost truncately 

 obtuse ; dorsal margins gently sloped ; lateral and ventral margins 

 creamy white ; umboes small, white, stained with pale, livid 

 purple. 



Long. . . . . 24 mm. 



Lat. . . . . 36-5 ,, 



Habitat — 'Andaman Islands. 



Batissa capillata, sp. nov. 



Shell sub- trigonal , inequilateral, thick, rather inflated, covered 

 with a dark, brownish black periostracum except in the umbonal 

 region where erosion has taken place, sculptured with coarse,' 

 irregular, concentric growth-lines which are obliquely crossed 

 posteriorly with coarse hair-like ridges ; anterior side somewhat 

 angularly rounded ; posterior side slightly produced, obscurely 

 angled ; ventral margin rounded ; ligament large, prominent ; 

 cardinal teeth broad and very coarse ; anterior lateral teeth elon- 

 gated, finely striate ; interior of shell purplish white, the purple 

 ■staining deepening posteriorly. 



Long. 



. . 



74 mm 



Lat. 





72 ,, 



Habitat- 



-Andaman Islands. 





Diplodonta insulsa, sp. nov. 



Shell obliquely sub-ovate, yellowish white, marked with fine, 

 concentric growth-lines ; anterior side obliquely rounded; posterior 

 side rounded ; dorsal margins gently sloped ; ventral margin 

 rounded ; umboes small, not prominent. 



Long. . , . . 8'5 mm. 



Lat. . . . . 10 ,, 



Habitat' — Andaman Islands. 



Donax iiuxfa^us, sp. nov. . • 



Shell elongately oblong, yellowish flesh coloured, sculptured 

 with fine, closely set transverse striae and posteriorly with irregular, 

 <:oncentric grooves disappearing towards the middle of the shell ; 

 anterior side produced, rounded ; posterior side acuminately 

 rounded ; anterior lateral margin gently sloped ; posterior lateral 

 margin more abruptly sloped : ventral margin undulately rounded ; 

 umboes rather large, livid purple. 



Long. . . . . 8 mm. 



Lat. ■ .. - .. 13-25 ,, . ■ •■ ■■■•' 



Habitat — Andaman Islands. 



