Ortmann; Families and Genera of Najades. .'!•".;» 



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 front 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 

 papillae. In front of the branchial, there are in the female upon the 

 inner edge of the mantle from eight to ten moderately large, subconical 

 jupillae, somewhat distant from each other, extending forward a certain 

 distance, but not to the middle of the lower margin. (See Ortmann, 

 19116, p. 317.) They are accompanied by a streak of black pigment. 

 Palpi connected only at base 01 posterior margins. Inner lamina of 

 inner gills free for one-fourth to one-half of the length of the abdominal 

 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. 



