202 Marsh — Cyclopidoe and Calanidce of Wisconsin. 



Family CYCLOPIME. 

 Genus CYCLOPS Mueller. 



KEY TO THE WISCONSIN SPECIES OF CYCLOPS. 



Antennae 17-jointed, fifth foot two-jointed, 



Second joint of fifth foot armed with seta and short spine,. 

 Terminal joint of outer branch of swimming feet armed, 

 extern ally with three spines, 

 Furca of moderate length, americanus. 



Furca elongated, brevispinosus. 



Terminal joint of outer branch of swimming feet armed 

 externally with two spines, parous. 



Second joint of fifth foot with two terminal setae, 



Furca short, navus. 



Furca elongated, pulchellus. 



Second joint of fifth foot, with one terminal and one lat- 

 eral seta, leuckarti. 

 Second joint of fifth foot, with three setae, signatus. 

 Antennae 16-jointed, fifth foot 3-jointed, modestus. 

 Antennae 12-jointed, fifth foot 1-jointed, 



Furca variable in length, armed externally with a row of 



small spines, sermdatus^ 



Furca short, without armature of spines, fluviatilis* 



Antennae 11-jointed, swimming feet three- jointed, phaleratus. 



swimming feet two- join ted, bicolor. 



Antennae 8-jointed, fimbriatus^ 



Cyclops americanus sp. nov. 

 Plate IV. Figs. 8-10. 



1882. C. ingens Herrick (23) p. 228, pi. V, figs. 1-8. 



1883. « viridis Cragin (24) p. 3, pi. IV, figs. 8-16. 



1884. " " Herrick (26) p. 145. 



