104 INSECTA 



(7) Sketch the abdomen, much enlarged. Name the parts 



present. 



(8) Metamorphosis complete or incomplete? Stages 



called 



SYSTEMATIC STUDY FOR BRANCH ARTHROPODA 



Use many different arthropoda for this study. 



1. The Body. 



(1) Segmented or unsegmented? 



(2) Symmetry? 



(3) Body cavities. One, the haemal. What systems does 



it contain? 



(4) The external skeleton (exoskeleton) . 



(a) Of what does it consist? 



(b) Use? 



2. The Appendages or Limbs. 



(1) Segmented or unsegmented? 



(2) Number? 



(3) Called what? 



(4) Position on the body? 



(5) Use? 



3. It belongs to Branch Arthropoda because it has the fol- 

 lowing Arthropod branch characteristics : (Name the character- 

 istics you have discovered and compare with those given in the 

 text.) 



SYSTEMATIC STUDY FOR THE CLASSES OF ARTHROPODA 



(Use a crayfish, an insect, a spider, and a ''thousand-legs.") 



1. Shape of each? 



2. Number of segments in each? 



3. Body divisions. 



(1) Do they show any body divisions? 



(2) If so, are they divided into head, thorax, and abdomen, 



or into cephalothorax and abdomen? 



4. Covering of each. 



If any, called what? 



5. Antennae wanting, or one or two pairs? 



6. Eyes. Compound, simple, or both? 



