210 
Marsh—Cyclopidaz and Calanidce of Wisconsin. 
mens have several, agreeing in ttds respect with the figure of 
Hoek. 
It occurs in both day and evening collections, and is gener¬ 
ally reddish in color. 
This is one of the most widely distributed of all the species 
of Cyclops , being found in various parts of Europe, in Asia, 
Africa, Madagascar, Ceylon, and the East Indies ( 34 ). Herrick 
mentions it as occurring in Alabama ( 30 ), and it is probable 
that it is widely distributed in America. It seems to me prob¬ 
able that the species identified by Herrick as oithonoides (26 y 
p. 150, pi. S, figs. 2-6), is really leuckarti. 
Brady’s scourfeldi corresponds to this species in all details 
except the armature of the terminal joint of the outer branch 
of the fourth foot. The special character by which he distin¬ 
guishes the species,—the marginal setae of the second maxilli- 
pedes,—I find in my specimens. In his figure of the fourth 
foot, the terminal joint of the outer branch has one spine and 
two setae on the apex, instead of the normal armature of one 
spine and one seta. Schmeil’s figure of the fourth foot ( 41 , ph 
III, fig. 6) shows an armature like that of the American speci¬ 
mens, and one cannot help thinking that Brady’s figure must 
have been drawn from an abnormal specimen. 
C. edax Forbes appears to differ from leuckarti only in that it 
lacks the ridge on the terminal joint of the antennae, and is. 
probably simply a less highly developed variety of the same 
species. 
There is considerable variation in the form of the spines of 
the swimming feet; in some specimens they are very slender and 
the joints are at the same time somewhat elongated, while in 
other cases they are robust. The robust form appears to be 
characteristic of the littoral specimens, and the slender form of 
the pelagic. 
The armature of the terminal joints of the swimming feet is 
as follows: 
FIRST FOOT. 
Outer br. ex. 2 spines. Inner br. ex. 1 seta. 
ap. 2 setae. ap. 1 spine, 1 seta, 
in. 2 setae. in. 3 setae. 
