486 



2. Pholas Chiloensis (pi. cii. f. 1, 2), King, Zool. Jourii. 

 vol. V. p. 334. Campecliensis, Gmel. 3216 ? Candida, var, 



Nonnul. 



Pli. testa aperta, elongata, subcyliudrica, ad extremitates rotun- 

 data ; costis validis, arcuatim imbricatis, omnino radiata ; lamiuis 

 dorsalibus, ad umbones duabus lougitudinalibus, turn una trans- 

 versali, una elongata postica. 



Elongated, rounded at both ends, ribs strong, radiating all over 

 the shell, fainter towards the posterior end, with arched imbrica- 

 tions. Accessory valves, two, on the umbones, large, with apices 

 posterior-central, one across, small, and one longitudinal, pos- 

 terior. 



Gmelin's Vh. Campechensis may possibly be the same species, 

 although named as inhabiting the bay of Camj)eche, while this is 

 from Chiloe {Cuming) ; but the figure and description are too ob- 

 scure to be depended upon. 



3. Pholas laqueata (pi. ciii. f. 19, 20), Sowerhy, jtrnr., 

 Pro. Zool. Soc, 1849. 



Ph. testa aperta, elongata, in medio ventricosa ; costis arcuatim 

 imbricatis, postice acute armatis; ad marginem dorsalem area 

 plana; laminis dorsalibus, ad umbones duabus longitudiualibus, 

 turn una transversali, una elongata postica. 



This shell differs from Ph. Chiloensis in having a small plain 

 area at the posterior dorsal margin. It also exhibits the pointed 

 imbrications on the posterior ribs, and the arched ones on the 

 central ribs, in stronger development. 



Collected at the Isle of Plata by Mr. Cuming. 



4. Pholas Orientalis (pi. cii. f. 3,4), Gmel. 3216. Chemn. 

 f. 860. 



Ph. testa aperta, elongata, postice attenuata ; costis crebris angu- 

 latim imbricatis antice radiata, postice Isevigata ; laminis dorsali- 

 bus, una ad umbones magna, ti^im una parva transversali, postice 

 una elongata. 



Open, elongated, with the ribs radiating over half the shell, the 

 posterior part being smooth. The principal dorsal valve broad, 

 with the apex prominent, one small cross-piece, and one narrow 

 and long. 



Found at the mouth of the Indus, Kurachee, Scinde. 



