North American Fresh-v:ater Ostracoda. 447 



as subterminal claw. Shell twice as long as high, 

 the upper and lower margins nearly parallel. (The 

 largest known fresh- water ostracode.) 



E. BARBATUS (Forbes). 

 7 (1). Caudal rami with only the terminal claws de- 

 veloped, lacking the terminal and dorsal seta. 

 Shell two and a half to three times as long as high. 

 Second foot slender, ending in a small hook and a 

 single weak seta. E. minnesotensis (Herrick). 



VII. Stenocypris Saks. 



1859. Cypris, Baird (3, p. 233). 

 1889. iHenocypris, Sars (57, p. 27). 



Natatory setae of the second antennae not reaching 

 be\^ond the tips of the terminal claws. Palp of the first 

 maxillae very narrow, cylindrical, the last segment small, 

 masticatory lobes long and narrow. 



Caudal rami rather large, more or less lamelliform, 

 dorsal edges sometimes pectinate; claws very unequal, 

 both coarsely denticulate; seta of dorsal edge absent or 

 very small, apical seta rather elongate. Propagation 

 exclusively parthenogenetic. 



Shell very narrow and elongate, height not nearly at- 

 taining half the length. This peculiarity is indicated in 

 the generic name. 



But one member of this genus has thus far been de- 

 scribed, and it has not been reported from America. 



VIII. Candona Baird. 



1792. Cypns, O. F. Mullcr (41), p. 48). 

 1850. Candona, Baird (2, p. 159). 



The following general description of this genus is 

 essentially that given by Vfivra (68, p. 39). 



Second antennae of female five-segmented, becoming 

 six-segmented in the male through division of the fourth 

 segment. Male provided at this dividing place with two 

 special and characteristic sense organs. Natatory setae, 

 so commonly present in Ostracoda, lacking in this 



