INDEX 



457 



Reptilian age, 426. 

 Ithamphorhynchus (illus.), 424. 

 Rhizoerinus loxotensis, 447. 

 Bhizostoma (illus.), 52. 

 Rocky Mountain locust (illus.), 134, 



267. 



Rocky Mountain sheep, 331. 

 Rodents, 240. 

 Rotatoria, 279. 

 Rotifers, 83. 

 Ruminants, 245. 



Sabella (illus.), 79. 



Sacculina, 114. 



Sacculina (illus.). 341. 



Salamanders, 184 ; (illus. }, 190. 



Salmo irideus (illus.), 310. 



Salmon, 172. 



Sand-dollar (illus.), 155. 



Sand-fleas (illus.), 122. 



Sandhoppers, 121. 



Sandpipers, 223. 



Sarcoptes scabei (illus.), 148. 



Sargassum, 355. 



Sauba (illus.), 367. 



Sauria, 193. 



Saurian bird (illus.), 431. 



Scale insect (illus.), 307. 



Scalops aquations, 242 ; S. argen- 

 teus, 242. 



Schilbeodes furiosus (illus.), 298. 



Scientific names, 15. 



Sciurus, 17, 19. 



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



Scorpion fish, noki or poisonous (il- 

 lus.), 298. 



Scotiaptex cinereua, 226. 



Scyphozoa, 51. 



Scyphozoan jelly-fish, development 

 of (illus.), 53. 



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

 (illus.), 55. 



Sea-cow (illus.), 238. 



Sea-cucumbers (illus. 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. 

 30 



Sedimentary rocks, 422. 



Segmented worms, 72. 



Selection, by nature, 284 ; natural. 

 287 ; artificial, 287. 



Self-defense, 392. 



Serpentes, 194. 



Serphus (illus.), 306. 



SerpJius dilatatus (illus.), 138. 



Serpula (illus.), 79. 



Shrimps, 116. 



Silurian age, 426. 



Silver-fox (illus.), 248. 



Silver-spot (illus.), 142. 



Simia, 250. 



Simplest animals, life cycle of, 254 



Sirenia, 239. 



Skates, 169. 



Skin of man, tactile papilla of (il 

 Ins.), 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 new 

 conditions, 438 ; debarred by ina- 

 bility to maintain their ground, 

 438. 



Species debarred by barriers, 437. 



tipeotyto cunicularia, 226. 



Sphenoden punctatus (illus.), 207. 



Sphinx moth (illus.), 362. 



Sphyvapicus carius, 229. 



Spiders, 145 ; habits of, 146 ; aggres- 

 sive resemblance (illus.), 359. 



Spiny-rayed fishes, 175. 



Spirifer camcratus Morton (illus.), 

 423. 



