UNTO.— Plate XLI. 



liqiie angiilato, siii/riuwalo, wnrgiiie ihrsali suhdedivi, 

 marr/ine latero-dorsali curio, ohliquo. 



IUghy's Unio. Shell compressed, wide, solid, straiglit, 

 white within, smooth, yellowish, green-rayed without, 

 anterior side very short, sloping, ventral margin a 

 little concex, posterior side oblong, subquadrate, ob- 

 liquely angular, subtruncated, dorsal margin slightly 

 sloping, latero-dorsal margin short, oblique. 



Lea, Unio, vol. iii. p. 75. pi. 22. f. 51. 



Hub. Big Bigby Creek, Tennessee. 



In some degree resembling U. rubigiiwsus. 



Species 238. (Mus. Cuming.) 



Unio DOLOSUS. Un. (esld subovatd, inflaln, leiiui, iufits 

 pnUide purpurea, extus sublavigatd, oUvaced, obscure 

 radiatn, latere antico brevi, angmtatd, rotunda, mar- 

 giiie ventrali medio conlraclo, postice inflate, latere 

 postico hiflato, lalo, snblruncato, margine dorsali ele- 

 vato, subalato, 7nargiue latpro-dorsali declivi. 



The sad Unio. Shell subovate, inflated, thin, pale purple 

 within, smooth, olive, obscurely rayed without, anterior 

 side short, narrow, rounded, posterior side inflated, 

 wide, subtruncated, dorsal margin elevated, somewhat 

 ivinged, latero-dorsal margin sloping. 



Lea, Unio, vol. \-iii. p. 79. pi. xi. f. 224. 



Ilnb. Alabama Eiver. 



