INDEX. 



Abdomen, of asellus, 125. 



of back-swimmer, 62. 



of beetle, 76. 



of bumblebee, 65. 



of butterfly, 42. 



of cicada, 60. 



of crawfish, 114. 



of cyclops, 127. 



of dragon fly, 45. 



of fly, 83. 



of grasshopper, 51. 



of mussel, 145. 



of pupa, 92. 



of rabbit, 243. 



of sparrow, 216, 221. 



of spider, 108. 



Acridium. See Schistocera. 

 Air sac of snail, 156. 

 Alimentary canal. See Digestive 



organs. 



Amoeba, 12, 278. 

 Amoeboid blood, 137. 

 Analogy, 45. 

 Anasa, 57. 

 Antenna, of crustacean, 118, 125, 127. 



of insect, 39. 



Antennule, 118, 125, 127. 

 Aorta. See Arteries. 

 Aperture. See Sponge gemmules. 

 Arachnida, 105-109. 

 Arm bones, of frog, 192. 



of rabbit, 257. 



of turtle, 206. 

 Arteries, of crawfish, 119. 



of fish, 163, 168. 



of frog, 182, 184. 



of mussel, 146. 



of rabbit, 247. 



of sparrow, 226. 



of turtle, 202. 

 Arthropoda, 128. 

 Asellus, 125. 

 Asilus, 85. 



Asterias, 266, 267. 

 Aves, 211. 



Backbone. See Spinal column. 



Back-swimmer, 61. 



Barbels, 162. 



Batrachia, 178, 198. 



Beak, 215. 



Bee killer, 85. 



Beetle, 74. 



blister, 74. 



Harpalus, 78. 



larvse, 79. 



locust borer, 78. 



red milkweed, 78, 



soldier, 77. 



whirligig, 79. 

 Birds, 211, 236. 

 Blastula, 159. 

 Blood, of fish, 163. 



of insects, 52, 94. 



of worm, 137. 



Blood vessel. See Circulatory or- 

 gans. 



Bluebottle fly, 80. 

 Body cavity j of starfish, 272. 



of worm, 136. 

 Bone. See Skeleton. 

 Books of reference, 275. 

 Brachystola, 52. 

 Brain. See Nervous system. 

 Branch, 128. 

 Branchial chamber, of crawfish, 113 



of fish, 170. 



of mussel, 144. 

 Budding, 27. 

 Bumblebee, 63. 

 Butterfly, 36. 



cabbage, 86, 89, 92. 



clover, 36. 



egg, 88, 90. 



larva, 88, 90. 



milkweed, 104. 



NEED. ZOOL. 20 



305 



