458 Illinois State Laboratory of Natural History, 



IX. Typhlocypris Vejdotsky. 



1880. Cyjiris, Vejdovsky (70, p. XLIX). 



1882. Gyims [Typhlocupris), Vejdovsky (71, p. 64). 



1891. Typhlocypris, Vavra (68, p. 51). 



Second antennae five-segmented in the female, and six- 

 segmented in the male through the division of the fourth 

 segment. Natatory setae absent, eyes lacking. The sec- 

 ond maxilla carries a rudimentary branchial plate formed 

 of two unequal plumose setge. 



Second pair of feet five-segmented, terminal segment 

 short, bearing two unequal backwardly directed setae, 

 and one long forwardly directed seta. 



This genus differs from the genus Candona principally 

 in the absence of ejes. On account of its haunting 

 dark places the e3'es have become rudimentary and, as a 

 partial substitute, the "sense organs" have been exces- 

 sively developed. 



This genus contains but one species, which as yet has 

 not been found in America. 



X. Candonopsis Yavra. 



1870. Candona, Brady & Eobertson (11, PL IX., Fig. 9-12). 

 1891. Candonopsis, Vavra (68, p. 51). 



Second antennae similar to those of Candona. Mandi- 

 ble provided with an extraordinarily long palp. Second 

 maxilla bearing a branchial plate formed of three plu- 

 mose bristles. Caudal rami slender, without the usual 

 dorsal seta. 



The female is as yet unknown. No members of this 

 genus have been found in America. 



XI. Ilyocypris Bkady & Norman. 



1820. Monoculus, Jurine (36, p. 177). 



1838-1868. O/jynV, Koch (38); Zaddach (74); S. Fischer (23); 



Lilljeborg (39); Brady (6). 

 1889. Ilyocypris, Brady & Norman (9, p. 106). 



Shell very strong, irregular, and spiny, somewhat re- 

 sembliuo: that of Liinuicvthere. 



