(■()lM!ICL']-.\. 



219 



slriaj; anterior side rounded ; posterior side soiiiewhni ungularly 

 rounded; lateral margins sloped; ventral margin rounded, sliglitlv 

 contracted towards the po^tt•^ior side ; umboes large ; interior of 

 shell purplish-white. 



Long. lO-o, lat, 12 mm. 



Hah. Phendiooganj, Hylhet, Assam. 



Tvpe in the Indian Museum, Calcutta. 



Allied to C. iravadica, Benson, but is more trigonal and more 

 swollen. 



357. Corbicula quilonica, Benson. 



Corhicuht quilonica, Benson, A. M. N. II. ser. 3, vi, 1860, p. 2(30. 

 Corbicula quilone^isis [sic] Benson ; Prime, Ann. Lye. Nat. Hist. 

 N.Y. \iii, 18tiH, p. 224, fig. 56; Cat. Corbicnlidte, 180!)-7O, 

 p. 135, no. 87; Clessin, in Martini k, Chemnitz, 1870, p. 135, 

 pi. 24, tig. 10. 



Original description :— Testa inscquilaterali, trigono-i'jiomboidea, 

 gibba," tenui, concentrice subremote costata, costis postice evanes- 

 centibm, sulcis iutermediis latioribiis, sub lente decussatim striatis, 

 allnda vel lutea, radiis fuscis angustis ornata ; umbonibus promi- 

 nentibus, apice fere eroso ; latere antico breviore, valde arcuato, 

 angustiore, postico striato, latiore ; superne et basin versus 

 angulata ; margine ventrali mediocriter arcuato ; ligameuto ob- 

 longo intra nates attenuate ; pagiiui interna valde concava,albida, 

 niacuHs radiisqiie purpureis ornata; dente mediana valvte dextra; 

 duplici, dentibus lateralibns brevibus serrulatis. 



Long. 8, lat. 10, diam. 5-5 mm. 



Hub. Near Quilon, in (probably brackish) ponds. 



The author adds a note to his description from which the 

 following may be quoted :— "The younger shells are more gibbous 

 towards the umbones in proportion to their length than the larger 

 specimens. A tawny-yellow epidermis covers the fresher speci- 

 mens. The rays are numerous, more or less broad, sometimes 

 appearing as mere lines of small sjjots, and occasionally spreadnig 



so as to make the surface appear nearly black The 



shortness of the lateral teeth, on the anterior side especially, is a 

 notable character, as well as the injctiuilateral form, which is 

 more conspicuous in the young than in the adult shell." 



358. Corbicula alberti, Preston, iu)m. nov. 



Corbicula vtolacea, Clessin, in Martini & Chenniitz, 1870, pp. 180- 

 181, p. 30, Hgs. 18, 19. 



Shell small, almost equilateral, swollen, fairly thin, polished, 

 shining, strongly and distantly ribbed, covered with a dark olive- 

 brown°periostracum ; anterior side scarcely attenuated, rounded ; 

 posterior side dilated, truncated ; vertical transverse section 

 cordate ; horizontal contour ovate ; umbones broad, inflated, 



