COIIBICULA. 221 



to the outer margins, the umbones themselves being of a reddish 

 colour; anterior side short, broadly rounded; posterior side 

 broad, somewhat truncate ; vertical transverse section narrowly 

 cordate ; horizontal contour almost cordate ; uinbones large, i'airly 

 prominent, much eroded ; anterior margin somewhat curved, 

 rounded, gradually passing into the ventral margin ; ventral 

 margin slightly arched ; posterior margin strongly curved, sepa- 

 rated from the ventral margin by a distinctly marked, somewhat 

 rounded angle ; ligament short, somewhat thick ; ligamental sinus 

 very shallow, slightly notched, elongate ; interior of shell dull, 

 except at the outer margin where it is polished, violet coloured ; 

 hinge margin rather narrow, bearing three cardinal teeth, the two 

 posterior comparatively strong, grooved above, the third or 

 anterior one very weak ; lateral teeth long, somewhat curved ; 

 muscle scars very shallow ; mantle scar distinct. 



Long. 21, lat. 22, diam. 14 mm. 



Hal. ? India. 



Type in Sandberger Coll., Wiirzburg. 



361. Corbicula indica, Clessin. 



Corbicula indica, Clessin, in Martini & Chemnitz, 1879, pp. 143-144, 

 pi. 25, figs. 21-23. 



Shell of medium size, slightly inflated, solid, somewhat inequi- 

 lateral, with glossy, strongly ribbed surface, the ribs somewhat 

 close and acute, covered with an olive-green periostracum and 

 painted with dark spots ; growth striae not distinct ; anterior side 

 somewhat shortened and pointed, posterior side slightly elongated, 

 truncate ; umbones large, scarcely prominent, very slightly re- 

 curved, eroded ; vertical longitudinal section broadly lanceolate ; 

 vertical transverse section very narrow, cordate ; horizontal contour 

 triangularly ovate ; anterior margin somewhat rouudedly pointed ; 

 lower margin strongly curved ; posterior margin forming a some- 

 what broad and short beak considerably roundedly angled on both 

 sides ; escutcheon and lunule scarcely visible ; ligament short, 

 fairly strong and prominent ; ligamental sinus short, shallow 

 triangular ; interior of shell dull, the outer margin only slightly 

 polished, tinged with violet, dorsal or hinge-margin white ; 

 cardinal teeth not divergent ; lateral teeth very elongate and 

 finely ribbed, equally strong over their whole length, the anterior 

 much stronger than the posterior ; muscle and mantle scars both 

 shallow. 



Long. 23, lat. 28, diam. 15 mm. 



Hab. ? India. 



Type in Gruner Coll., No. 518. 



362. Corbicula regia (Benson MS.), Clessin. 



Corbicula regia (Benson MS.), Clessin, in Martini & Chemnitz, 



1879, p. 267, pi. 43, fig. 5. 

 Shell small, ovate, solid, much inflated, very inequilateral, with 



