PARRIvYSIA 1 1 1 1 



Var. pinax (Benson). 



Shell smaller than the type, somewhat elongated. I quite 

 agree with Hanley and Theobald in considering this a small 

 variety of favidcns. 



Length 49, height 30 mm. 

 Unio pinax Benson, Ann. and Mag., 1862, p. 192. 

 Unio fazndens var. pinax Hanley and Theobald, Conch. Ind., 



1876, p. 6, pi. XI. fig. 2. 

 Porreysia fa-iidens var. pinax Simpson, Syn., 1900, p. 843. 



Var. plagiosoma (P)enson). 



Another small form with rather narrow elevated beaks, the 

 general form being much like that of faz'idcns. 



Length 40, height 28 mm. 

 Unio plagiosoma Benson, Ann. and Mag., X, 1862, p. 191. 

 Unio faz'idens var. plagiosoma Hanley and Theobald, Conch. 



Ind., 1876, p. 6, pi. XI, fig. 3. 

 Parrcvsia fazidcns var. plagiosoma Simpson, Syn., 1900, p. 



843. 

 Var. assamcnsis Preston. 



"Shell more convex than the typical form, the dorsal margin 

 is rather less posteriorly angled, the anterior side more rounded 

 and the posterior slightly more nasute." (Preston). 



Type locality, Digong ; also Assam and Arrah. 

 Parreysia fazndens var. assamcnsis PresiTon, Rec. Ind. Mus., 



VIE, 1912, p. 299. 



Parreysia bhamoensis (Theobald). 



vShell subtriangular, subinflated, solid, inequilateral ; beaks 

 high and full, with zigzag-radial sculpture, which does not 

 extend over the disk ; posterior ridge narrowly rounded, end- 

 ing in a point below the median line ; anterior end and base 

 evenly rounded : outline of dorsal slope arcuate but higher 

 just behind the ligament ; surface with irregular growth lines, 

 usually corrugated on the upper anterior part and the dorsal 

 slope, green-brownish and yellowish-banded, shining; hinge 



