36 
Records of the Indian Museum. [Vor. XII, 
Chione imbricata, Sow. 
Thes. Conch. II, 1855, p. 715, pl. clvi, figs. 81, 82. 
Ennur backwater, Madras. 
Chione marmorata, Lamarck. 
Anim. s. Vert. V1, p. 261 (as Venus). 
Cochin backwater, near Ernakulam. 
Anomalocardia squamosa, Lin. 
Syst. Wat.ied, 12;5p..4133, 
Ennur backwater, Madras (young specimens only). 
Tapes turgida, Lamk. 
Anim, s. Vert. VI, p. 353 (as Venus). 
Cochin backwater, near Ernakulam. 
Family CyRENIDAE. 
Corbicula cochinensis, sp n. 
Shell small, trigonal, covered generally and in type specimen 

FiG. 12, 12a,—Corbicula cochinensis sp. n. 
Pic. 126.— 
with a dark olive periostra- 
cum and showing traces of 
radiate painting; umbones 
not very prominent; both 
valves somewhat contracted 
in the posterior median part 
and coarsely and somewhat 
distantly, cotcentrically 
ridged towards the umbonal 
region, the ridges becoming 
suddenly finer and more 
closely-set and continuing 
thus to the margin: dorsal 
margin narrowly and strong- 
ly arched: ventral margin 
gently anteriorly rounded, 
x 6. elongated and very slightly 
do., hinge, x 9. Contracted posteriorly ; pos- 
terior side steeply sloping 
above, rounded below ; anterior side also sloping above, rostrate 
below ; inte1ior of shell dark livid brownish-violet. 
Long. 4, lat. 4 5 mm. 
Hab.— Cochin backwater, near Ernakulam. 
