Index 



369 



Nucleus, 286, 287, 301. 



Of paramecium, 294. 

 Numbfish, 170. 

 Nuthatch, 241. 

 Nymph, 13. 



Octocoralla, 329. 



Octopus, 143. 



Odonata, 13, 15. 



Odor of snakes, 204. 



Oil gland of pigeon, 215, 217. 



Olfactory lobe, 285. 



One-celled animals, 286. 



Opercle of perch, 154, 160. 



Operculum of snail, 128, 129. 



Ophiuroidea, 337, 347. 



Opossum, 257, 258. 



Oral arms of jellyfish, 323. 



Surface of starfish, 331. 

 Orang-utan, 283. 

 Organism, 305. 

 Organs, 304. 

 Orioles, 239, 243. 

 Orthoceras, 144. 

 Orthoptera, 12. 

 Osculum of sponge, 307. 

 Osphradia of snails, 130. 

 Osprey, 233. 

 Ossicles of sea urchin, 338. 



Of starfish, 331. 

 Ostracoda, 83. 

 Ostriches, 222, 223. 

 Otter, 282. 

 Ovary of bird, 218. 



Of crayfish, 65. 



Of earthworm, 89, 91. 



Of frog, 182, 183. 



Of grasshopper, 10. 



Of hydra, 313, 317. 



Of perch, 157. 



Of sea urchin, 341. 



Of snake, 201. 

 Oviduct of crayfish, 65. 



Of earthworm, 97. 



Of frog, 182, 183, 189. 



Of grasshopper, 10. 



Of perch, 157, 162. 



Of pigeon, 215, 219. 



Of snake, 201. 

 Ovipositor of grasshopper, 10. 



Ovum, 302. 

 Owls, 234, 235. 

 Oyster, 122. 



Crab, 79, 80. 



Distribution of, 123. 



Season, 123. 



And starfish, 335. 



Palp of clam, in, 114. 

 Palpus of grasshopper, 4. 

 Pancreas of pigeon, 215. 



Of rabbit, 249, 250. 



Of snake, 201. 

 Panther, American, 279. 

 Paramecium, 291, 292. 

 Parasites of grasshopper, 9. 



Of rabbit, 252. 

 Parasitic arachnids, 60. 



Birds, 220. 



Crustacea, 83. 



Hymenoptera, 52. 



Protozoa, 297. 



Worms, 349, 351, 352. 

 Parrakeet, 236, 237, 

 Parrots, 236. 

 Partridge, 231. 

 Paunch of cow, 270. 

 Peafowl, 232. 

 Pear-tree slug, 51. 

 Pearls, 126. 

 Peccary, 269. 

 Pectinatella, 354. 

 Pedicellariae of sea urchin, 340. 



Of starfish, 332. 

 Pelecypoda, 102. 

 Pelican, 228. 

 Pen of squid, 139. 

 Penguins, 225. 

 Perch, 154. 



Development of, 162. 



Fins of, 154. 



Opercle of, 154, 160. 



Ringed, 154. 



Sea, 171. 

 Perching, 213. 



Birds, 239. 



Pericardium of clam, 115. 

 Periodical cicada, 22. 

 Perisarc of hydroid, 320. 

 Perissodactyls, 267. 



