INDEX 



613 



Spermatheca, 227. 

 Spermatocytes, 106. 

 Spermatogenesis, 106. 

 Spermatozoon, 10. 



of Ascaris, 299. 



of crayfish, 264, 266. 



of earthworm, 228. 



of frog, 65, 92, 94, 106. 



of Hydra, 171. 



of man, 10. 



of Nematoda, 309. 

 Sphenodon, 394. 

 Sphincter, pyloric, of dogfish, 353. 



of frog, 50. 

 Spiders, 267, 268, 516. 

 Spinal cord, 27. 



of frog, 27, 68, 98. 

 Spindles, cell-, 105. 

 Spine. See Backbone. 

 Spine, haemal, of dogfish, 346. 



neural, 27, 346. 



of scapula of rabbit, 433. 

 Spinules, ofliver, fluke, 201. 

 Spiracle, 340, 353, 377, 380. 

 Spireme, 105. 

 Splanchnoccele, 486. 

 Splanchnopleure, 485. 

 Spongioplasm, 84. 

 Spores, 127. 

 Sporoblast, 155, 156. 

 Sporocyst, 205, 208. 

 Sporont, 126, 155. 

 Sporozoa, 143, 513. 

 Staining, 553. 

 Statocysts, of crayfish, 244, 261. 



of medusa, 178. 



of mussel, 323. 

 Stegocephali, 384. 

 Sterna, of crayfish, 240. 

 Sternum, absent in dogfish, 344. 



of lizard, 583. 



of Ornithorhynchus, 460. 



of pigeon, 407. 



of rabbit, 426, 427. 



structures representing, in frog, 

 37- 

 Stigmata, of cockroach, 277. 

 Stipes, 274. 

 Stomach, 18. 



of crayfish, 249. 



of dogfish, 353. 



Stomach — 



of frog, 47. 



of medusae, 176, 186. 



of rabbit, 441. 

 Stomodaeum, 493. 

 Strobilisation, 188. 

 Structure and function, 17. 

 Struggle for existence, 16, 17. 

 Sturgeon, 380. 

 Styles, of cockroach, 276. 

 Subclass, 513. 

 Subkingdom, 513. 

 Submentum, 274. 

 Subphylum, 513. 

 Subplantigrade, 464. 

 Subumbrella, 176. 

 Succus entericus, 50. 

 Suckers, of leech, 234. 



ofliver fluke, 201. 

 Suina, 467. 



Suprarenal body, 51, 444. 

 Suspensorium, 34. 

 Swan mussel. See Mussel, swan. 

 Symbiosis, 168. 

 Symmetry, 24. 



bilateral, 24. 



radial, 178. 

 Synangium, 53. 

 Synapticulae, 332. 

 Syncytium, 119, 248, 297. 



in Ascaris, 297. 



in egg of crayfish, 265. 



in epidermis of crayfish, 248. 



Tadpole, 23, 493. 

 Tcenia solium, 209. 

 T. ccenurus, T. echinococcus, 7. 

 saginata, T. serrata, 212. 

 Tail, 327, 339. 



of Amphioxus, 327. 



of Cetacea, 462. 



of dogfish, 340, 341. 



of fishes, 380. 



of newts, 383. 



of pigeon, 397. 



of rabbit, 418. 



of tadpole, 23, 339,492. 493, 495- 



vestigial vertebras of. See 

 Coccyx, Pygostyle, Uro- 

 style. 

 Tail-fan, 427. 



