UNIO.— Plate XCIV. 



Species 513. (Mu^. Haiiley.) 

 Unio SaLWENIANUS. Uu. te^ilu Viilir/d, cf),u;:ni. iinili- 

 subrhomboided, scepim-vibo/jUrjiid, ra/i/t i,irn//ii/„/,'rn//, 

 infcnie siibarenatd, maryiiif lii/aineiitali roi/n'.ro,J'/iscd 

 cotirolore, pr/pi-ipue leevi, in et nupra contam muhiiHaleiu 

 itwonsjiicuam porcu diven/eniibus mbremotis oruatd, 

 natibux eminentibm, maryarita livklo-carnvd ; mar- 

 i/'mi' cnrdinnlia-itgHStissimo, tubercidi) nnico in uirdque 

 vnlvuld, tranxverso simpUcI nrcuato lami'llifornii, tari- 

 lirni iMtriiclo. 

 The Salwen TJnio. Slu-ll strong, convex, oval-siib- 

 rhomboidal, usually somewhat slanting, very inequi- 



lateral, somewliat arched lielow. lioanientiil edge 

 convex, of a uniform dark brown, for the nio;?t part 

 smooth, but upon and beyond the inconspicuous 

 lunbonal ridge adorned with rather distant divergent 

 ridges ; beaks prominent, nacre livid flesh-colour ; 

 hinge-margin very narrow, only furnished with a 

 transverse simple arched lamellar tubercle in each 

 valve. 



Goi'LP \Anodoii and Pseududuii). Froc. Bost. Soc. N. H. 

 vol. i. p. 160. 



Hnb. River Salwen, British Birmah. 



A typical form of the subgenus Fscndodou. 



