64 THE NAUTILUS. 



quite to the middle of the mantle margin. In the male, these 

 papillae are also indicated, but very small and indistinct. 



Palpi connected on the posterior margin at base only. Inner 

 lamina of inner gills entirely connected with abdominal sac. 

 Gills typically Lampsiline: the marsupium of the female is kid. 

 ney-shaped, and located in the posterior half of the outer gill- 

 with a small non-marsupial part at the posterior end of the gill- 

 The number of ovisacs in my specimen is 12. 



Glochidia nearly subspatulate, considerably higher than long. 

 Length: 0.21, Height: 0.27 mm. 



Color of soft parts whitish. Mantle-margin blackish in the re- 

 gion of the anal and branchial, the blackish pigment extend, 

 ing forward along the base of the papilla?. Edge of marsupium 

 broadly black. 



Simpson places this species by the side of E. trabalis (Con- 

 rad). According to the anatomy this affinity is correct. Also 

 the glochidia are similar. Although I have called them in tra- 

 balis, (1. c. p. 340) "subovate," they are almost subspatulate, 

 as is clearly seen in the figure (pi. 20, f. 4). 



EUBYNIA (MICROMYA) NEBULOSA (Conrad) (See: Lampsilis n. 

 Simpson, 1900, p. 553). 



I collected a large number in North Fork Holston River, Salt- 

 ville, Smyth Co., Va. (Sept. 17, 1912), and in Clinch River, at 

 Cedar Bluff, Richland, and Raven, Tazewell Co., Va. (Sept. 20 

 and 21, 1912). The preserved gravid females all had glochi- 

 dia. 



Anal separated from the supraanal by a moderate mantel- 

 connection, which is shorter than the anal. Inner edge of anal 

 crenulated. Branchial with papillae. In front of the branch- 

 ial, in the female, there are 6 to 10 rather large, conical papil- 

 lae, somewhat irregular in size, and remote from each other: the 

 largest are forward. These papillae do not quite reach the mid- 

 dle of the mantle margin. In the male, these papillae are also 

 indicated, but very small. 



Palpi connected at the posterior margins at base only. 



Inner lamina of inner gills connected with abdominal sac. 

 Gills lampsiline: the marsupium of the female is kidney-shaped, 



