I915.] H.B. Preston: Mollusca from Lake Chilka. 305 
slopingly rounded at the ventral corner and sharply so at the 
dorsal corner; right valve bearing a single cardinal tooth which 
is grooved below and posteriorly erect above; left valve furnished 
with a very anteriorly erect, somewhat claviform, cardinal tooth. 
Long. 49°25, lat. 9°5 mm. 
Hab.—Satpara Bay. 
Solen kempi, sp. n 
(Figs. 18, 182.) 
Shell differing from S. annandalet, in its smaller and propor- 
tionately much narrower form, it is of a thinner texture and the 
concentric growth lines are not so clearly marked, the anterior 
side is more obliquely truncate, the cardinal tooth in the right 
(7a. 
Fic. 17.—Solen annandalei, sp. n. X 1}. 
» 17a.— (hinge) ee 
Fe 13. —Solen kempi, Sp. ni Xie. 
18a.— ,, Ae (hinge) X 13. 
valve is grooved, though only shallowly, throughout its whole 
breadth, while that in the left valve is more rigidly erect, even 
than is the case in S. annandalez. 
Long. 43, lat. 6-5 mm 
Hab.—z20 miles S.E. by S. of Patsahanipur, 54 feet. 
Sub-order MYACEA. 
Family MACTRIDAE. 
Standella annandalei, sp. n. 
(Figs. 19, 19a-b, p. 306.) 
Shell thin, fragile, gaping posteriorly, broadly cuneiform, 
whitish, covered with a thin brownish yellow periostracum, con- 
centrically striate; umbones small; dorsal margin arched ante- 
