340 ANNALS OF THE CARNEGIE MUSEUM. 
Tdi male, the structure is similar, but the papilla on the edge of 
the mantle are very small. 
Color of so{t parts whitish, edge of mantle brownish black, most 
intense behind, with a black streak along the base of the papilla. 
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 papilla 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 other, 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, pl. 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. 
