PHYLUM ARTHROPODA 



529 



Cyclops (Fig. 416, 1} has been compared in form to a split pear, 

 the broad end being anterior, and the convex surface dorsal. 

 The first thoracic segment is fused with the head, and the 



l.C V C I O b S 



2 . C a I o' c a lanus 



FIG. 41C. la, female Cyclops, from the right side; b, dorsal view; C, antenna of male; 



D, swimming-foot, ulnl.1, first abdominal segment,; ant.l, antemiule ; ant.:?, antenna; 



. c. tl/. cephalo-tkorax ; e. median eye ; en. eudopodite ; e.s. egg-sac ; ex. exopodite ; or. ovary ; 



pi:l, pr.2, protopodite ; r. rostrum; s./. swimming-feet ; th.2, th.6, thoracic segments. (After 



Huxley, Gerstaecker, Hartog, and Giesbrecht.) 



cephalo-thorax (c-.tli.) thus formed is covered with a carapace pro- 

 duced in front into a short spine or rostrum (r), near the base 

 of which, on the dorsal surface, is the median eye (e). There are 

 five free thoracic segments : the last (tli. 6) bears the genital 

 VOL. I M M 



