PHYLUM ARTHROPODA 



293 



FIG. 209. FIG. 210. 



FIG. 209. Dorsal surface of a Trilobite, Triarthrus becki. (From Sedg- 

 wick's Zoology, after Beecher.) 



FIG. 210. Order PHYLLOPODA. A, Branchipus stagnalis; B, Artemia salina. 

 (From Verworn, after Semper.) 



.anl.Z, 



dyl 



9 



FIG. 211. V X FIG. 212. 



FIG. 211. Order CLADOCERA. Daphnia, a water-flea. ant.i, antennule ; 

 ant. 2, antenna ; br, brain; br.p, brood-pouch; E, eye; d.gl, digestive gland; 

 /, swimming feet ; hi, heart ; sh.^l, shell-gland. (From Parki-r and Haswell, 

 after Claus.) 



FIG. 212. Subclass OSTRACODA. Cypris candid't. i, antennules; -', anten- 

 nae; 3, mandibles; 4, ist maxilleC ; 5, 2d maxilla;; 6, ist pair of legs; 7, 2d pair 

 of legs ; <?, tail ; Q, eye. (From Shipley and MacBride, after Zenker.) 



