406 



ZOOLOGY 



Natatores, 305, 3U. 



Natica, 168, 175. 



Naticidse, 175, 170. 



Nautilus, 173. 



Nebalia, 122. 



Necturus, 257, 335. 



Nemathelminthes, 386. 



Nematocera, 61, 66. 



Nematus, eggs of, 40. 



Nemertini, 158. 



Nephelis, 140. 



Nereida, 159. 



Nereis, 136, 138, 145, .146, 159; food 

 and habitat of, 145. ' 



Nest, of barn-swallow, 292; of chim- 

 ney-swift, 302 ; of pewee, 296. 



Neuroptera, 11-12. 



Newts, 254, 362; how to capture, 255. 



Night-hawk, 303. 



Nightingale, 285. 



Nile varan us, 269. 



Noctuidae, 27-28, 41. 



Norwegian lobster, 113. 



Notodelphys, 263. 



Notolophus, 28. 



Nuculidae, 191. 



Nuthatches, 286. 



Nymphs, 21. 



O 



Obelia, 210. 



Odd-toed ungulates, 327. 



Odonata, 9. 



(Estridae, 64. 



Oligochaeta, 132, 136, 139. 



Oniscus, 112. 



Operculum, of worms, 151 ; of fish, 

 233. 



Ophidia, 280. 



Ophion, 39. 



Ophiuroidea, 198, 203. 



Opisthobranchiata, 161. 



Opisthobranchs, 164, 170-171; degen- 

 eration of shell of, 162. 



Opossum, 322-323. 



Orang-utan, 330. 



Orbitelariae, 86, 96. 



Orb-weavers, 86, 96. 



Orbweb, diagram of, 86; of Epiera, 

 87 ; nomenclature of parts of, 86. 



Orbweb spiders, 80. 



Orca, 325. 



Orchard oriole, 293. 



Orchelium, 6. 



Ornithorhynchus, 321. 



Orthoptera, 1. 



Orthosoma, 54. 



Osmerus, 230. 



Ostracoda, 127, 131. 



Ostrea, 187. 



Ostreidae, 190; economic importance 

 of, 187. 



Ostrich, 307; habits of, 307-308. 



Otter, 328. 



Owlet moths, 27-28, 41. 



Owls, 298. 



Oxen, 326. 



Oxyrhyncha, 123. 



Oyster drill, 169. 



Oysters, 187-188, 190. 



Paddlefish, 247. 



Paguridse, 105, 123. 



Painted turtle, 276. 



Palaeinonetes, 104. 



Paliuurus, 101. 



Pallene, 95. 



Palm-crab, 107. 



Pandoridae, 189. 



Pandorus, 23. 



Panopeus, 109. 



Papilionidae, 41. 



Papilio, 21. 



Paramecium, 222, 229; food of, 224; 



fusion of, 229; habitat of, 224; rate 



of division, 229. 

 Parasites of fly, 63. 

 Parasitic, flies, 70; Hymenoptera, 43; 



worms, 158. 

 Paridaj, 286, 316. 

 Parrots, 297. 

 Partridges, 304. 

 Passenger pigeon , 303. 

 Passer, 281-282. 

 Passeres, 315. 



