344 ANNALS OF THE CARNEGIE MUSEUM. 
Eurynia (Eurynia) subrostrata (Say). 
According to Lea’s description (Obs., X, 1863, p. 439, glochidia 
XIII, 1874, pl. 21, fig. 1, as nashvillensis), and, relying principally 
upon the figure given by Lefevre and Curtis (1910, pl. 1, fig. 2), 
this species belongs here. 
Eurynia (Eurynia) recta (Lamarck). 
Numerous specimens from the Ohio drainage and Lake Erie in 
western Pennsylvania, from Ohio and Arkansas have been investi- 
gated. 
Bradytictic. The breeding season begins about the middle of 
August, and ends unusually late, in July (latest date July 23). Speci- 
mens with fully developed glochidia have repeatedly been found in 
Fic. 24. Eurynia (Eurynia) recta (Lamarck). Gravid female, from Lake Erie, 
Cedar Point, Erie Co., O. (Carn. Mus., No. 61, 4,458.) Coll. August, 1909, by 
Chas. Brookover. 
July, and for specimens with eggs the earliest date is August 13. 
Although there is apparently an interim of a few weeks, the seasons 
come very near to overlapping. But for single individuals there is 
very likely a longer interval between the breeding seasons, for sterile 
females are very frequent in August and September, and the majority 
do not become gravid till October. I cannot detect any difference 
in this matter in Lake Erie. At any rate, the beginning and end of 
the breeding season are not laver than in the Ohio, in fact the latest 
date for the end (July 23) is from the Ohio drainage. 
The soft parts have been discussed by Lea (Obs., X, 1863, p. 426) 
