6l2 



INDEX 



Secondary remiges, 401. 

 Secretion, 5, 17, 543. 



in plants, 531. 

 Section cutting, 554. 

 Segmentation, metameric, 230. 



in Amphioxus, 326. 



in crayfish, 239. 



in dogfish, 342, 491. 



in earthworm, 230. 



in frog, 421, 491. 



in rabbit, 421. 



in tadpole, 498. 



in tapeworm, 231. 

 Segmentation of ovum. See Cleav- 

 age. 

 Sense organs, 18. 



of Amphioxus, 337. 



of cockroach, 280. 



of crayfish, 261. 



of dogfish, 371. 



of earthworm, 222. 



of frog, 80. 



of pigeon, 417. 



of rabbit, 457. 



of swan mussel, 323. 



See also Ear, Eye, Cnidocil, 

 Olfactory organs, Statocyst. 

 Senses, of crayfish, 261. 



of dogfish, 371. 



of frog, 79. 



of Vertebrata, 79. 

 Septum, nasal, 82, 346, 430, 437. 



interorbital, of pigeon, 405. 

 of reptiles, 386. 

 Setse, of earthworm, 216, 217, 420. 



of Nereis, 232. 



coxopoditic, of crayfish, 241. 

 Setobranch, 241. 

 Sex, 9, 197. 



Sexual reproduction. See Repro- 

 duction. 

 Sheep, 467. 



heart of, 586. 



skull of, 465. 



stomach of, 465. 

 Sinus, pericardial, of crayfish, 253. 



sternal, of crayfish, 256. 



urinary, of dogfish, 356. 



urinogenital, of dogfish, 356. 



venosus, of dogfish, 359. 

 of frog, 53, 54, 50. 



Sinuses, vascular, of crayfish, 256. 



of dogfish, 362. 



of leech, 238. 

 Siphons, of mussel, 312. 

 Sirenia, 462, 519. 

 Skate, 377- 



blood vessels of, 377. 



heart of, 377. 



nervous system of, 378. 



various organs of, 376. 

 Skates, 377. 

 Skein (or spireme), 105. 

 Skeleton, 18, 40. 



of cod, 577. 



of crayfish, 246. 



of dogfish, 344. 



of frog, 27, 28. 



of pigeon, 402. 



of rabbit, 422. 



of skate, 376. 



endophragmal, 248. 



visceral, of dogfish, 347. 



preparation of, 555. 

 Skin, of bird, 399. 



of dogfish, 343. 



of frog, 25, 61, 93. 



of lizard, 389. 



of mammal, 420. 



"scarf," 92. 

 Skull, 27. 



of Amphibia, 384. 



of bird, 505. 



of Capitosaurus, 385. 



of dog, 427, 469, 470. 



of dogfish, 346. 



of frog, 27, 30. 



of lizard, 580, 582. 



of pigeon, 405. 



of rabbit, 427. 



of reptiles, 386. 



of whiting, 577. 

 Sleeping sickness, 149. 

 Slits, gill-, of Amphioxus, 328. 



of dogfish, 350. 



snail, 325. 

 Snakes, 385, 392. 

 Soil, action of earthworm on, 215. 

 Somatopleure, 485. 

 Somites, mesoblastic, 481, 484, 



491. 498. 

 Species, 512. 



