II20 P.VRRCYSIA 



Pakj{FA'sia burmama (Blanford). 



Shell subelliptical, solid, convex, decidedly inequilateral, 

 blackish or fuscous-olive, concentrically plicate striate ; disks 

 with oblique, angular, subgranulose sculpture in the middle 

 and behind ; unibonal region full and wide ; beaks with zigzag- 

 radial sculpture; posterior ridge full, narrowly rounded; an- 

 terior end rounded ; dorsal outline well arched ; basal line near- 

 ly straight ; posterior end rounded, very slightly produced at 

 or below the median line; pseudocardinals short, somewhat 

 ragged ; laterals remote, elevated ; nacre salmon to bluish 

 white. 



Length 52, height 35, diam. 22 mm. 



Length 45, height 32, diam. 20 mm. 



Burma. 

 Unio burmanus Blanford. Pr. Zool. Soc. Lond., 1869, p. 449. 



— VON Martens, Arch, fur Naturf., 1899, p. 38, pi. v, fig. 5. 

 Unio birmaniis Hanlky and Theobald, Conch. Ind., 1876, p. 



19, pi. XLII, fig. I. 

 Parreysia burmanus Simpson, Syn.. 1900, p. 845. 



Two young shells from Fea, collected in the Upper Irrawady 

 River, are in the National Museum. Their color is yellowish- 

 green, with darker bands. This seems to differ from P. corbis 

 in having the dorsal outline much rounded and that of the base 

 nearly straight, and in having a considerable part of the sur- 

 face sculptured, while corbis is smooth. 



P.-vRRE"S'SL\ siKKiMENSis (Lea). 



Shell rather short, subrhomboid, subsolid, subinflated, in- 

 equilateral ; beaks apparently moderately full and elevated, 

 with zigzag-radial sculpture that sometimes extends well on 

 to the disk ; posterior ridge double, though sometimes scarcely 

 so. ending in a biangulation near the base of the shell ; surface 

 finely, concentricallv sculptured; epidermis greenish-brown, 

 scarcely shining; pseudocardinals much split up, with denti- 

 cles behind them ; laterals short, high, remote ; anterior scars 

 impressed ; nacre white, or bluish, somewhat iridescent. 



Length 32, height 21, diam. 14 mm. 



Length 30, height 21, diam. 13 mm. 



Sikkim ; Tulpigorie, India. 



