Nortli American Fresh-water Ostracoda. 469 



5 (G). Natatory setae of second antennae reaching to 



the end of the terminal claws. Shell pale green. 



C. viLLosA (Jurine). 



6 (5). Natatory setae of second antennae reaching 



beyond the end of the terminal claws. Shell grass- 

 green, at least dorsally. 



C. SMARAGDINA V4vra. 



Cypridopsis vidua (0. F. MtJLLER). 



1792. i ypris vidua, O. F. Miiller, (49. p. 55, Tab. lY., Fig. 7-9). 



1820. Monoculus vidua, Jurine (36, p. ]75, PI. XIX., Fig. 5, 6). 



1837. Cyprismaculaia, Kocti (38, H. X., p. 2, Fig. 2). 



1841. Cypris strigata, Kocli (38, H. XXXVI., p. 19, Fig. 19). 



1844. Cypris vidua, Zaddach (74, p. 35). 



1850. Cypris vidua, Baird (2, p. 152, PI. XIX., Fig. 10, 11). 



1850. Cypris sella, Baird (2, p. 158, PI. XIX., Fig. 5, 5a). 



1851. Cypris vidua, S. Fischer (23, p. 162, PI. XI,, Fig. 1-2). 



1853. Cypris vidua, Lilljeborg (39, p. Ill, Tab. X., Fig. 10-12). 



1854. Cypris vidua, Zenker (75, p. 79). 



1868. Cypridopsis vidua, Brady (6, p. 375, PI. XXIV., Fig. 27- 



30, 46). 

 1868. Cypris vidua, Claus (17, PI. I., Fig. 6-8). 



1868. Cypris vidua, Fric & Neliut (27, p. 48, Fig. 29). 



1869. Cypridopsis obesa, Brady & Robertson (lO, p. 364, PL 



XVIII., Fig. 5-7). 



1870. Cypridopsis obesa, Brady & Robertson (11, p. 15). 



1871. Cypris vidua. Heller (31, p. 90). 



1872. Cypris vidua, Fric (26, p. 227, Fig. 27). 



1874. Cypridopsis obesa, Brady, Crosslcey & Robertson (14, p. 128, 

 PI. 1., Fig. 1-4). 



1879. Cypri:vidua,B.QVv\ck (32, p. 112, PI. XVII., Fig. 1). 



1880. Cypridopsis vidua, Robertson (55, p. 20). 



1887. Cypridopsis vidua, Herriclc 34, p. 31, PI. IV., Fig. 1). 



1888. Cypris vidua, Sostaric (60, p. 46). 



1889. Cypridopsis vidua, Brady & Norman (9, p. 89). 



1891. Cypridopsis vidua, Vavra (68, p. 75, Fig 23i-23*). 



1892. Cypridopsis vidua, Turner (62, p. 73). 



1893. Cypridopsis vidua, Daday (19, p. 300). 



1894. Cypridopsis vidua. Turner (64, p. 19). 



1895. Cypridopsis vidua. Turner (35. p. 312, Pi. LXXII., Fig. 



1-1;/; LXXV., Fig, 5, 6, 8, 9; LXXVI., Fig. 4, 7). 



This well known species needs no extended notice in 

 this paper. 



