650 



APPENDIX B 



Fig. B.18. Representative crustaceans. A, Asellus, a fresh-water isopod about half an inch 

 long. B, Callinectes, the edible blue crab. C, Cyclops, a minute plankton copepod. D, 

 Homarus, the lobster. E, Daphnia, a small plankton phyllopod. F, Squilla, the mantis 

 shrimp, several inches long. G, Balanus, a rock barnacle. (Modified from Turtox chart, 

 courtesy General Biological Supply House, Inc.) 



Fig. B.19. Representative arachnids. A, Mastigoproctus, a nonpoisonous though formida- 

 ble-looking whip scorpion. B, a true scorpion with stinging tail. C, a typical spider, order 

 Araneae. D, a water mite, order Acarina. E, a tick, order Acarina. (Modified from Turtox 

 chart, courtesy General Biological Supply House, Inc.) 



