LAMELLIDEXS. 



185 



valva? siuistrse sab.simplicibus,dextrie duplicibus laniiuatis,laterali- 

 bus remotis subelongatis, valvje sinistra? duplicibus, lamina interna 

 demuni incrassata ; margarita violaceo-albida, iridescente. 



Long. 52, lat. 94, diam. 38 mm. 



Hah. Bralimapootra Eiver, Assam. Tlie following localities 

 are, among otbers, attached to specimens in the Indian Museum : — 

 Sylhet, Bhagalpur {Captain Sherivilly. 



Subsp. sawaddyensis, Preston, Eec. Ind. Mus., Calcutta, vii, 

 1912, p. 305. 



Orif/inal description : — Shell much more ovate and convex than 

 the typical form, having the dorsal margin more arched and 

 posteriorly ascending, the ventral margin and anterior side more 

 rounded, and the posterior side produced and roundly rostrate. 



Hab. Sawaddy Eiver. Specimens in the Indian iNIuseum are 

 labelled Bhamo"(Z>j-, J. Anderson) ; Shuaygoomyo, Upper Burma 

 (Dr. J. Anderson), and Mandalay {Dr. N. AnnandaU). 



The type is in the Indian Museum. 



311. Lamellidens pulcher {Tapparorie-Canefri). 



Lainellidens jndc/ier (Tapparone-Canefri) ; Simpson, Wasliiugton, 

 D.C., Smiths. lust., Nat. Mus. Proc. xxii, 1900. p. 856. 



Unio 2)>dcher, Tapparone-Canefri, Ann. Mus. Civ. St. Nat. Geneva, 

 vii, 1889, p. 350. 



Original desa^iption : — Testa tenui, subcompressa, inaequilaterali, 

 transverse ovata, subquadrata, postice dilatata, sub-biangulata, 

 area postica depressa, margine ventrali rectiusculo, umbonibns 

 baud eminentibus, rarius integris, ssepius breviter decorticatis. 

 Superficies valvariun lievis, nirida, rugis concentricis minutis, 

 subregularibus, sa;pe obsoletis exarata; pallide olivaceo-castauea, 

 radiis duobus iniequalibus in area postica fuscis vel viridibus 

 picta. Dentes cardiuales parvi, laminati, infero in valva dextera 

 crassiusculo, subtrnncato, superne acuto. Margarita argentea, 

 superne luteo-carnea vel luteola. 



Long. 43, lat. 70, diau). 22 mm. 



Bab. Meetan, Eiver Honngdaran (L. Fea). 



The author also describes two varieties of this species as 

 follows : — 



A^ar. lamellatiformis. 



Testa magis postice dilatata. infei'ne bisinuata. 

 Long. 43. lat. 76, diam. 21 mm. 



Yar. ponderosiis. 



Testa majore, crassiuscula, magis lata, subquadrato-oblonga, 

 superficies valvarum castanea vel castaneo-fusca. 

 Long. 48, lat. 84, diam. 28 mm. 

 Both the varieties are from the same locality as the type. 



