P.XKRLvYSIA II 17 



surface somewhat concentrically sculptured, sometimes having 

 faint zigzag sculpture; epidermis dirty yellowish-green in 

 young shells, brown on old specimens, scarcely shining; pseu- 

 docardinals subtriangular, low, but little ragged; laterals re- 

 mote, curved, not strongly developed, granular ; muscle scars 

 well marked ; beak cavities only moderately deep ; nacre flesh- 

 colored, often luridly blotched in old shells. 



Length 54, height 45, dia. 27 mm. 



Length 60, height 41, diam. 28 mm. 



Burma. 

 Unio fecc Tai'perone-Canici'ri, Ann. Mus. Civ. Gen., 2d ser., 



Vn, 1889, p. 340. 

 Parreysia fecv Simpson, Syn., 1900, p. 844. 



This species has never been figured, so far as I know. Three 

 shells bearing the name Unio fees Tapperone-Canefri, from 

 Fea himself, taken from the Houngdaran River, Burma, are 

 before me and they show it to be a variable species. One of 

 them is quite rhomboid ; the other two are subtriangular. The 

 laterals are not strongly developed and are granular some- 

 thing like those of P. biesiana. 



Parri^ysia rajah?:nsis (Lea). 



Shell inflated, solid, triangular, slightly inequilateral ; beaks 

 full and high, their sculpture not seen ; lunule well marked ; 

 posterior ridge high, subangular ; above this there is a radial 

 furrow ending in a sinus, and the dorsal slope is subtruncated ; 

 anterior end angled at its junction with the depressed lunule, 

 obliquely truncate below this, rounded below ; base rounded, 

 fullest just behind the middle; surface with decided, concen- 

 tric growth lines ; epidermis brownish-green, slightly banded, 

 shining; hinge line arched; pseudocardinals ragged; anterior 

 scars deep; nacre bluish, silvery and iridescent. 



Length 36, height 29, diam. 21 mm. 



Calcutta. 

 Unio rajahensis Lka, Pr. Am. Phil. Soc. H, 1841. p. 30; Tr. 



Am. Phil. Soc, VIH, 1842, p. 239, pi. xxrii. fig. 53 ; Obs., 



in, 1842, p. yy, pi. XXIII, fig. 53. — Chenu, 111. Conch., 1858, 



pi. XXVI, figs. 3, 3a, 3&. 



