340 Annals of the Carnegie Museum. 



In the male, the structure is similar, but the papillae on the edge of 

 the mantle are very small. 



Color of soft parts whitish, edge of mantle brownish black, most 

 intense behind, with a black streak along the base of the papillae. 



Eurynia (Micromya) trabalis (Conrad). 



Three complete specimens and the soft parts of nine others from the 

 Cumberland River in Pulaski, Wayne, and Cumberland Cos., Ken- 

 tucky, have been received from B. Walker; from the same source 

 came five other soft parts from Obey River, Celina, Clay Co., Ten- 

 nessee. All are gravid females with glochidia. 



On the inner edge of the mantle in front of the branchial are ten 

 to fourteen subcylindrical papillae of medium size, which are distant 

 from each other, subequal, with a few smaller ones between them and 

 in front of them. Inner lamina of inner gills connected with ab- 

 dominal sac. Marsupium formed by about the posterior half of the 

 outer gill, with an unusually long section non-marsupial at the posterior 

 end. Ovisacs eight to twenty-four. Edge of marsupium broadly and 

 intensely black. Glochidia rather large, subovate. Length 0.22; 

 height 0.27 mm. (see Plate XX, fig. 4). 



All other characters are like those of E. fabalis. 



Eurynia (Micromya) vibex (Conrad). 



I have investigated a sterile female of the var. nigrina (Lea) from 

 Lake Monroe, Sanford, Orange Co., Florida, collected by O. T. Cruik- 

 shank in April, 1907. 



On the inner edge of the mantle in front of the branchial there are 

 about ten subcylindrical, subequal papillae of medium size, rather 

 distant from each othei , with a few smaller ones anteriorly and pos- 

 teriorly to them, not reaching the middle of the lower margin. Mar- 

 supium formed by about the posterior half of the outer gill. Ovisacs 

 twenty, with blackish ends. Charged marsupium and glochidia un- 

 known, but the latter have been figured (as of U. rutilans) by Lea 

 (Obs., VI, 1858, pi. 5, fig- 4). 



In other respects this species is like E. trabalis. 



Eurynia (Micromya) lienosa (Conrad). 

 I have three males and three gravid females (with glochidia) from 

 Pearl River, Jackson, Hinds Co., Mississippi, collected by A. A. 



