LAMELLIDENS. 187 



312. Lamellidens exanthematicus (Kilster). 



Lamellidens exanthematicus (Kiister) ; Simpson, Washington, D.C., 

 Smiths. Inst., Nat Mus. Proc. xxii, 1900, p. 856. 



Unio exanthematicus, Kiister, Conch. Cab., Unio, 1861, 1 p. 243, 

 pi. 81, fig. 2; Psetel, Conch. Sam. iii, 1890, p. 152. 



Original description : Testa trans versa, subovata, convexa, 

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

 tiliter striata, subtil issime pustulata, pustulis numerosis, majoribus 

 minoribusque mixtis ; umbonibus prominulis ; area subtrigona, 

 compressiuscula ; dentibus cardinalibus parvis, minus elevatis, in 

 valvula utraque duplicibus, lamellis longis, curvatiusculis ; rnar- 

 garita carneo-alba et iridescente. 



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



Hob. East Indies. 



313. Lamellidens canefrianus, Simpson. 



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



Nat. Mus. Proc. xxii, 1900, p. 857. 

 Unio protemus, Tapparone-Canefri, Ann. Mus. Civ. St. Nat. Genova, 



vii, 1889, p. 349. 



Original description : Testa transverse oblonga, insequilaterali, 

 postice subbiangulata, inter angulos truncata et in rostrum 

 abbreviatum attenuata, margine ventral! inodice arcuato et ad 

 rostrum sinuato, umbonibus late decorticatis. Superfices val- 

 varum epidermide kevi, intense fusca in adultis, viridi-olivacea 

 in junioribus induta, zona marginal! pallidiore inferne ornata. 

 Dentes cardinales tenues, in valva dextera duo majusculi, 

 laciniato-striati, inargine denticulati, in valva sinistra unicus, 

 tenuior, ultra medium siibacutus. Margarita argentea, postice 

 vivide iridescens ; superficies interna valvarum saepius plus 

 minusve margaritifera. 



1. 2. 



Long. ........ 89 65 mm. 



Lat 44 34 mm. 



Diam 27 18 mm. 



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



314. Lamellidens narainporensis, Preston. 



Lamellidens narainporensis, Preston, Hec. Ind. Mus., Calcutta, vii 

 1912, pp. 305-306. 



Original description : Shell cuneate, moderately convex, pos- 

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

 with a finely laminiferous periostracum, marked with concentric 

 lines of growth, bearing two carina3 on each valve running from 

 the umbones in a dorsally posterior direction; umbones small, 

 not prominent, somewhat coarsely corrugated; dorsal margin 



