46 



PHYLLOPODA 



3. Daphnia, the water-flea. Mount on slide, and keep in place by supported coverslip. Low 

 power. Head ; fused compound eyes ; median simple eye ; first pair of antennae (rudimentary but 

 seen with high power) ; second pair of antennae, large and biramous with long bristles bearing 

 delicate hairs ; mouth ; hepatic diverticula of anterior part of alimentary canal ; heart ; brood pouch, 

 probably containing ova or embryos ; thoracic appendages ; abdomen curved ventralwards within 

 the valves of the shell, which is formed by the prolonged lateral halves of the carapace ; anus terminal 

 and slightly dorsal ; terminal setae. 



Notice the circulation of the blood as shown by the movement of the corpuscles. 



