208 
Marsh—Cyclopidce and Calanidce of Wisconsin. 
separating our American form from C. pulchellus Koch, or bicus - 
pidatus Claus. All the European descriptions agree very closely 
with our form. We find in C. thomasi the same variations which 
Yosseler records in the European form,—for example, the vari¬ 
able position of the lateral spine of the furca. In general form,,, 
length of antennae, form of furca and armature of swimming- 
feet and fifth feet, it is difficult to find any clear distinction, 
between the forms of the two continents. I cannot agree with 
Herrick and Brady in considering C. bisetosus Rehberg a syno¬ 
nym of pulchellus , for pulchellus has the swimming feet armed 
with two spines externally, while bisetosus has three, and my 
observations lead me to think that the armature of the swim¬ 
ming feet is quite constant. 
The armature of the terminal joints of the swimming feet is. 
as follows: 
Outer br. ex. 
ap. 
in. 
2 spines. 
2 setae. 
2 setae. 
FIRST FOOT. 
Inner br. ex. 
ap. 
in. 
Outer br. 
SECOND AND THIRD FEET, 
ex. 2 spines. Inner br. ex. 
ap. 1 spine, 1 seta. ap. 
in. 3 setae. in. 
1 seta. 
1 spine, 1 seta. 
3 setae. 
1 seta. 
1 spine, 1 seta.. 
3 setae. 
Outer br. 
FOURTH FEET. 
ex. 2 spines. Inner br. ex. 1 seta, 
ap. 1 spine, 1 seta. ap. 2 spines, 
in. 3 setae. in. 2 setae. 
C. pulchellus occurs everywhere in the great lakes in pelagic- 
collections, and in some of the smaller lakes of Wisconsin. 
Cyclops parcus Herrick. 
Plate IV, fig. 16; plate V, fig. 1. 
1882. C. parcus Herrick (23), p- 229, pi. VI, figs. 12-15. 
1884. “ “ “ (26), p. 148, pi. R, fig. 22. 
C. parcus, in the armature of the swimming feet is like C. 
pulchellus and C. navus, while its fifth feet are like those of G. 
americanus and C. brevispinosus, although the basal joint is,- 
