LAMELLIDENS. 187 



312. Lamellidens exanthematicus (Kiiste)-). 



LameUi(le7is cvaniJicmaticHs (Kiister) ; Simpson, Washington, D.C., 

 Smiths. Inst., Nat. Mus. Proc. xxii, 1900, p. 8o6. 



Unio exanthematicus, Kiister, Conch. Cab., Unio, 1861,' p. 213, 

 pi. 81, tig. 2; Pfetel, Couch. Sam. iii, 1800, p. 152. 



Original description :— Testa transversa, subovata, convexa, 

 tenuis flava, fuscescenti-annulata, postioe viridi-radiata, sub- 

 tiliter striata, subtilissime pustulata, puslulis numerosis, majoribus 

 minoribusquo mixtis ; umbonihus proiniiiulis ; area subtrigona, 

 compressiuscula ; dentibus cardinalibus parvis, minus elevatis, in 

 valvula utraque duplicibus, lamellis longis, curvatiusculis ; mar- 

 garita carneo-alba et iridescente. 



Long. 26, lat. 43, diam, 13-5 mm. 



Hah. East Indies. 



313. Lamellidens canefrianus, Simpson. 



Lamellidens canefrianus, Simpson, Washington, D.C., Smiths. Inst., 



Nat. Mus. Proc. xxii, 1900, p. Sol. 

 Unio protensHS, Tapparoue-Cauefri, Ann. Mus. Civ. St. Nat. Genova, 



vii, 1889, p. 349. 



Oriijinal description:— Testa transverse oblonga, insequilaterali, 

 postice subbiangulata, inter angulos truncata et in rostrum 

 abbreviatum attenuata, margine ventrali modice arcuato et ad 

 rostrum sinuato, uiubonibus late deeorticatis. Supertices val- 

 varum epidermide h^vi,' intense fusca in adultis, viridi-olivacea 

 in junioribus induta, zona marginali pallidiore interne ornata. 

 Dentes cardinales tenues, in valva dextera duo majusculi, 

 laciuiato-striati, margine denticulati, in valva sinistra unicus, 

 teuuior, ultra medium subacutus. Margarita argentea, postice 

 vivide iridescens ; superlicies interna valvanim saepius plus 

 minusve margaritifera. 



1. 2. 



Long 89 65 mm. 



Lat 44 34 mm. 



Diam 27 18 mm. 



Hah. Prome, Lower Burma (L. Fea). 



314, Lamellidens narainporensis, Preston. 



Lamellidens narainporensis, Preston, Kec. lud. Mu?., Calcutta, vu 

 1912, pp. 305-306. 



Original description :— Shell cuneate, moderately convex, pos- 

 teriorly rostrate, dark reddish-brown^ covered towards the margins 

 with a finely laminiferoiis poriostracum, marked with concentric 

 lines of growtli, bearing two carinie on each valve running from 

 the umbones in a dorsally posterior direction ; umboues small, 

 not prominent, somewhat coarsely corrugated ; dorsal margin 



