UNIO.— Platk XXIII. 



The Napeax Unio. Shell oblong-ovate, anterior side 

 somewhat attenuately rouuded, posterior broadly 

 truncately rounded, scarcely angled, largely plieately 

 wrinkled about the umboes ; fuscous-black. 



t'oNKAL), ;MS. in JIns. Cuming. 



llnb. ■ ? 



A pitchy-black shell, of rather light substa 

 coarsely plieately wrinkled about the umboes. 



nmhonibus immik, latere unlico ruluudato, poHlco 

 clecUvi-lruncaio, haud angulato ; fuho-viridi, bnaines- 

 cente tinctd, laviyatd, rdtenle. 



Layard's Unio. Shell rather obliquely ovate, ventricose, 

 umboes swollen, anterior side rounded, posterior side 

 slopingly truncated, not angletl ; fulvous-green, tinged 

 with brown, smooth, shining. 



Lea, Pro. Acad. Nat. Sei. Philad. 1«.51», p. I5;J. 



Hub. Ceylon ; F. l.ayard. 



Species 111. (Mus. Cuming.) 

 iiDi. Un. Ifstd ssiiboblique ovata, cmtncom, \ 



Of an Anodou- 

 homy epidermis. 



ike fori: 



ed bv 



