V. DESCRIPTIONS OF SIX NEW SPECIES 



OF SHEEIvS FROM BENGAL 



AND MADRAS. 



By H. B. Preston, F.Z.S. 



Acmaea travancorica, sp. nov. 



Shell oval with subcentral apex, pale brownish yellow with 

 occasional blotches of dark purple, sculptured with moderate] 5^ 

 coarse, radiate riblets crossed by somewhat fine, concentric striae, 

 presenting a slightly cancellate appearance; margin arcuate, finely 

 denticulate by the terminations of the radiate riblets, regularly 

 spotted with purple ; interior of shell iridescent. 



Fig. I, — Acmaea travancorica, sp. nov. 



Altitude 

 Diam., major 

 minor 



5 mm. 

 16-5 ,, 



Hah. — Vurkala}', Travancore Coast (Dr. N. Annandale) : on 

 rock between tide marks. Type in Indian Museum, Calcutta. 

 (M. ^-V^-^) 



Corbula chilkaensis , sp. nov. 



Fig. 2. — Ccrhula chilkaensis, sp. nov. 



Shell thin, greyish white, concentrically striate, posteriorly 

 rostrate where it is covered by a blackish, foliaceous periostracum ; 

 umboes rather large, but not very prominent, situate one behind 

 the other, a keel descending from these in a posterior direction ; 

 right valve somewhat sinuous, especially posteriorly ; dorsal 



