ORTMANN: FAMILIES AND GENERA OF NAJADES. 339 
its base upon the mantle. My specimens show no pigment at the edge 
of the marsupium. 
Eurynia (Carunculina) texasensis (Lea). 
I have only the soft parts of a male, sent by L. S. Frierson from 
Bayou Pierre, De Soto Parish, Louisiana. 
In this species a distinct supra-anal is present, longer than the 
mantle-connection, which equals the anal. Inner lamina of inner 
gills free from the abdominal sac for more than half the length of the 
latter. In tront of the branchial there is a group of fine, crowded 
papillae, accompanied by a black mark. This structure indicates that 
the female probably has a “‘caruncle”’ similar to that of E. parva. 
In other respects, there is revealed no appreciable difference from 
the latter species, but the female is as yet unknown. 
Eurynia (Carunculina) paula (Lea). 
Eurynia (Carunculina) glans (Lea). 
These two species belong here according to Lea’s description (Obs., 
X, 1863, pp. 402 and 405). 
Eurynia (Micromya) fabalis (Lea). 
Three males and one sterile female from the Ohio drainage of western 
Pennsylvania have been investigated. 
The soft parts have been described by Lea (Obs., X, 1863, p. 423). 
Anal and supra-anal are separated by a mantle-connection of mod- 
erate length, shorter than the anal. Anal crenulated, branchial with 
papilla. In front of the branchial, there are in the female upon the 
inner edge of the mantle from eight to ten moderately large, subconical 
papilla, somewhat distant from each other, extending forward a certain 
distance, but not to the middle of the lower margin. (See Ortmann, 
1911), p. 317.) They are accompanied by a streak of black pigment. 
Palpi connected only at base o1 posterior margins. Inner lamina of 
inner gills free for one-fourth to one-half of the length of the abdomina] 
sac (differing in this from other species of the subgenus). 
Marsupium formed by the posterior part of outer gills (a little less 
than one half of the length), a very small portion non-marsupial at 
posterior end. Ovisacs at least seventeen. Charged marsupium and 
glochidia not seen. Edge of marsupium whitish in my specimen. 
