INDEX 



457 



Reptilian age, 426. 

 Jthamphorhynchus (illus.), 424. 

 Rhizoerinus loxotensis, 447. 

 Rhizostoma (illus.), 52. 

 Bocky Mountain locust (illus.), 134, 



267. 



Rocky Mountain sheep, 331. 

 Rodents, 240. 

 Rotatoria, 279. 

 Rotifers, 83. 

 Ruminants, 245. 



Sdbetta (illus.), 79. 



Sacculina, 114. 



Sacculina (illus.). 841. 



Salamanders, 184; (illus. ), 190. 



Salrno irideus (illus.), 3K. 



Salmon, 172. 



Sand-dollar (illus.), 155. 



Sand-fleas (illus.), 123. 



Sandhoppers, 121. 



Sandpipers, 2?3. 



Sarcof)tes scdbei (illus.), 148. 



Sargassum, 355. 



Sauba (ill us.), 367. 



Sauria, 193. 



Saurian bird (illus.), 431 



Scale insect (illus.), 307. 



Scalops aquaticus, 242 ; S. argen- 

 teus, 242. 



Schilbeodes furioKus (illus.), 298. 



Scientific names, 1 5. 



Sciurus, 17, 19. 



Scorpion (illus.',, 144; (illus.), 293. 



Scorpion fish, noki or poisonous (il- 

 lus.), 298. 



Scotiaptex cinere.ua, 226. 



Scyphozoa, 51. 



Scyphozoan jelly-fish, development 

 of (illus.), 53. 



Sea-anemones (illus.), 54; section of 

 (illus.), 55. 



Sea-cow (illus.), 238. 



Sea-cucumbers (illns. 156), 155, 160., 



Sea-lily (illus.), 157. 



Sea-mats, 85. 



Sea squirt (illus.), 162; (illus.), 345. 



Sea-urchins (illus., 154), 151 ; meta- 

 morphosis of (illus.), 271. 



Sedimentary rocks, 422. 



Segmented worms, 72. 



Selection, by nature, 284 ; natural 

 287 ; artificial, 287. 



Self-defense, 392. 



Serpent es, 194. 



Serphus (illus.), 306. 



Serphus dilatatus (illus.), 188. 



Serpula (illus.), 79. 



Shrimps, 116. 



Silurian age, 426. 



Silver-fox (illus.), 248. 



Silver-spot (illus.), 142. 



Simla, 250. 



Simplest animals, life cycle of, 254, 



Sirtnia, 239. 



Skates, 169. 



Skin of man, tactile papilla of (il 

 lus.), 374. 



Skinks, 199. 



Slipper animalcule, 26. 



Snakes, 194. 



Snail, 97, 98; marine (illus.), 100; 

 tongue rasp of (illus.), 101. 



Snipes, 223. 



Social wasp, nest of (illus.), 328. 



Solaux, 275. 



Soup-fin shark (illus.), 169. 



South American realm, 443. 



Special senses, importance of, 371 ; 

 difficulty of the study of, 371 ; of 

 the simplest animals, 372; touch, 

 373 ; taste, 375 ; smell, 376 ; hear- 

 ing, 379 ; sound - making, 382 ; 

 sight, 384. 



Species altered by adaptation to ne\ 

 conditions, 438 ; debarred by ina- 

 bility to maintain their ground, 

 438. 



Species debarred by barriers, 437. 



Kpeotyto cunicularia, 226. 



Sphenoden punctatus (illus.), 207 



Sphinx moth (illus.), 362. 



Sphyrapicus cariux, 229. 



Spiders, 145 ; habits of, 146 ; aggres- 

 sive resemblance (illus.), 359. 



Spiny- rayed fishes, 175. 



Spirifer camcratus Jforfon (illus.), 

 423. 



