52 



CLASSIFICATION OF THE ANIMAL KINGDOM. 



Fig. 46. Copepoda. A, Female of Cyclops asquoreus, seen from above, and greatly en- 

 larged, with the external ovisacs. B, Female of Cydopiiw. littoralis, viewed from one side, 

 and greatly enlarged. (After G. S. Brady.) 



c 



Fig. 47. Cladocera. Bosmina Icevis, greatly enlarged, the internal organs showing through 

 the translucent shell : a, Antennules ; an, Antennae ; c, Cephalic ganglion, terminating in 

 front in a mass of ganglion-cells at the base of the antennules ; e, Eye ; m, Mandible ; i, 

 Alimentary canal; g, Shell-gland; h, Heart; o, Ovum contained in the brood sac; ab, Ex- 

 tremity of the abdomen, with terminal claw-like appendages. (After Leydig.) 



