xi i CONTENTS 



XX. BRANCH ARTHROPODA : THE CRUSTACEANS, CEN- 

 TIPEDS, INSECTS, AND SPIDERS. 



CLASS CRUSTACEA: CRAYFISHES, CRABS, LOBSTERS, ETC. 



EXAMPLE; THE CRAYFISH (CAMBARUS SP.). Structure, 146. Life-his- 

 tory and habits, 146. 



OTHER CRUSTACEANS. 



Body form and structure, 147. Water-fleas (Cyclops], 148. Wood-lice 

 (Isopoda), 150. Lobsters, shrimps, and crabs (Decapoda), 151. Barnacle*, 



XXL BRANCH ARTHROPODA (CONTINUED). 



CLASS INSECTA : THE INSECTS. 



EXAMPLE : THE RED-LEGGED LOCUST (MELANOPLUS FEMUR-RUBRUM^ 

 [Laboratory exercise]. External structure, 157. Life-history and habits, 

 161. 



EXAMPLE: THE WATER- SCAVENGER BEETLE (HYEROPHILUS SP.) [Labo- 

 ratory exercise]. External structure, 163. Internal structure, 166. Life- 

 history and habits, 169. 



EXAMPLE : THE MONARCH BUTTERFLY (ANOSIA PLEXIPPUS) [Laboratory 

 exercise]. External structure, 171. Life-history and habits, 175. 



EXAMPLE : LARVA OF MONARCH BUTTERFLY [Laboratory exercise]. 

 Structure, 177. 



OTHER INSECTS. 



Body form and structure, 181. Development and life-history, 188. 

 Classification, 191. Locusts, cockroaches, crickets, etc. (Orthoptera), 192. 

 The dragon-flies and May-flies (Odonata and Ephemerida), 194. The 

 sucking-bugs (Hemiptera), 197. The flies (Diptera), 201. The butterflies 

 and moths (Lepidoptera). 205. The beetles (Coleoptera), 206. The 

 ichneumon flies, ants, wasps, and bees (Hymenoptera), 212. 



CLASS MYRIAPODA : THE CENTIPEDS AND MILLIPEDS. 



CLASS ARACHNIDA : THE SCORPIONS, SPIDERS, MITES, AND TICS. 



XXII. BRANCH MOLLUSCA : THE MOLLUSCS. 



EXAMPLE : THE FRESH-WATER MUSSEL (L^Nio SP.) [Laboratory exercise]. 

 Structure, 239. Life-history and habits, 243. 



OTHER MOLLUSCS. 



Body form and structure, 245. Development, 246. Classification. 246. 

 Clams, scallops, and oysters (Pelecypoda), 246. Snails, slugs, nudi- 

 branchs, and "sea-shells" (Gastropoda), 252. Squids, cuttlefishes, and 

 octopi (Cephalopoda), 255. 



