338 Annals of the Carnegie Museum. 



3. Subgenus Eurynia (sens, strict.). 



On the edge of the mantle in front of the branchial a long row of quite 

 regular, uniform, smaller or larger papillae, reaching to about the middle 

 of the lower margin. Inner lamina of inner gills connected with ab- 

 dominal sac, but a small hole at the posterior end of the foot is some- 

 times left open. Shell of medium size or large, subelliptical, elongated, 

 more or less pointed behind. Beak-sculpture sinuated, or double- 

 looped, the posterior loop often open behind. 



Type E. recta (Lamarck). 



Eurynia (Carunculina) parva (Barnes). 



Three gravid females, from the outlet of Conneaut Lake in Crawford 

 Co., Pennsylvania, are at hand. 



These specimens were collected on June 17, 1909, and contained only 

 eggs and no glochidia, thus showing that the breeding season must begin 

 unusually early. 



The soft parts have been described by Lea (Obs., VII, i860, p. 221) 

 and a figure is given (pi. 29, fig. 102), which shows the shape of the 

 marsupium and the position of the "caruncle." Other descriptions 

 of the soft parts are those of Call (1895, p. 35) and Simpson (in Baker, 

 1898, p. no). 



As I have previously stated (Ortmann, 191 lb, p. 314) a very small 

 supra-anal seems to be present in one of my specimens, while in the 

 others it appears entirely closed. No additional material has come 

 to hand. The anal is finely crenulated, the branchial has papillae. 

 In front of the branchial, the inner edge of the mantle carries a group 

 of distinct and crowded papillae of various sizes (see Ortmann, 191 lb, 

 p. 317) occupying only a short space on the edge of the mantle, which 

 further in front is smooth. Palpi connected at base only. 



Diaphragm and gills of usual structure. Inner lamina of inner gills 

 free for more than one-half of the length of the abdominal sac. Mar- 

 supium kidney-shaped, occupying about the posterior half of the outer 

 gill, formed (in my specimens) by eleven to sixteen beaded ovisacs, 

 projecting beyond the gill. 



Glochidia not observed. They have been figured by Lea (Obs., 

 XIII, 1874, pi. 21, fig. 2), and have the usual subovate shape found in 

 this genus. 



Color of soft parts whitish. Anal and branchial with brown and 

 black margins. Group of papilla? brown-black, with a black mark on 



