762 



INDEX 



Seminal vesicles, of A scar is, 138 

 of cockroach, 236 

 of dogfish, 334 

 of earthworm, 173 

 of frog, 379 

 of liver fluke, 122 

 of man, 482 

 of pigeon, 414 

 Seminiferous tubules, 379 

 Semipermeable membranes, 194 

 Sense organs, 534 



of cockroach, 236 

 of crayfish, 213 

 of dogfish, 339 

 of earthworm, 171 

 of frog, 389 

 of lancelet, 308 

 of pigeon, 415 

 of rabbit, 464 

 of snail, 269 

 of swan mussel, 281 

 See also Ear, Eye, Olfactory 

 organs, Statoc3^st 

 plate, 635 



-tentacle of starfish, 288 

 Senses of Amceba, 29 



of man, 480 

 Sepia, 285 



Septa of earthworm, 160, 164 

 Septum, interorbital, of pigeon, 402 



nasal, 317 

 Sero-amniotic connection, 655 

 Serpula, 184, 185 

 Serum, 524 



Sessile animals, 56, 298, 310 

 Setae, of crayfish, 198, 215 



of earthworm and Nereis. See 

 Chaetae 

 Sex, 6 



a Mendelian character, 701 

 determination of, 679, 701 

 -linkage, 701 

 Sexual reproduction, 6 

 Shank, 418 

 Shards, 245 

 Sharks, 544 

 Sheep, 457, 492, 558 

 skull of, 494 

 stomach of, 493 

 Shell, egg. See Reproduction 

 gland of dogfish, 335 

 of liver fluke, 123 

 of snail, 266 

 of swan mussel, 271 

 Shield of crayfish, 196 

 Shore crab, 194 

 Shoulder blade, 356 

 Shrimp, 221 



Shrews, 476 



Sialis liitaria, 254 



Silica, 86 



Silk, 222 



Silver-fish, 246, 249 



Simplicidentata, 484 



Sinu-auricular valves of frog's heart, 



370 

 Sinus, pericardial, of crayfish, 205 



sternal, of crayfish, 206 



terminalis, 659 



urinary, of dogfish, 334 



urogenital, of dogfish, 334 



venosus, of chick embryo, 659 



of dogfish, 325, 329 



of frog, 369 



of tadpole, 64 

 Sinuses, vascular, of Cockroach, 



235 

 of crayfish, 206 



of dogfish, 331 



of leech, 182 

 Siphonophora, 112 

 Siphons of dogfish, 335 



of gnats, 257, 258 



of mussel, 273 

 Sirenia, 491 

 Sitta, 721 



Six-hooked embryo, 128, 129 

 Skates, 544 

 Skeletal tissues, 506 

 Skeleton, appendicular, 421 



a.xial, 421 



endophragmal, 201 



mesodermal, 296 



of crayfish, 201 



of dogfish, 315 



of frog, 349 



of pigeon, 400 



of rabbit, 421 



of vertebrates, 552 

 Skin, as respiratory organ, 589 



of bird, 397 



of dogfish, 313 



of frog, 346, 347, 348 



of lancelet, 301 



of mammal, 508, 516, 52y 

 Skull, 572 



of Capitosauriis, 578 



of cat, 432 



of cod, 575 



of crocodile, 580 



of dog, 425 



of dogfish, 316 



of frog, 352 



of kangaroo, 495 



of lizard, 582 



of man, 479 



