INDEX 



skull: amniote stage, 150, 151; 

 amphibian stage, 150; develop- 

 ment of, 142-145; ganoid stage, 

 146; selachian stage, 144-146. 



slime canals, 469 



sloths, 113, 316, 393 



small intestine, 294 



smell, 468, 476-485 



smell-buds, 471 



snakes, 110, 166, 377, 398, 432, 433, 

 441, 483, 487, 505 



soft palate, 266, 271 



soma, 7, 11, 48, 58 



somatic cells, 55 



somites, 27 



somites of head, 458-463 



sparrow, 419 



spermatic cord, 396 



spermatic fluid, 49, 52, 380, 381, 383 



spermatogonium, 55, 56, 57 



spermatophores, 383 



spermatozoon, 48, 49, 50, 51, 52, 55, 

 58, 366, 379, 382, 397, 401 



Sphenodon, 32 



spider, 259 



spinal cord, 427, 428; caliber of, 



432, 433 ; columns of, 434 ; length, 

 428-431 ; shape of cross-section, 



433, 434 



spinal ganglia, 436, 437 

 spinal nerves, 427-434 

 spinous processes, excessive devel- 

 opment of, 134 

 spiny ant-eater, 33 

 spiracular cartilage, 155 

 spiracular opening, 493, 494 

 spiraculum, 155, 269 

 spleen, 293, 363. 

 Squalus, 388, 446 

 squid, 499 

 squirrel, 316 

 squamosals, 82, 83, 147 

 stapedial artery, 159 

 stapes, 159, 337, 495 

 Stegocephali, 30, 31, 32, 44, 84, 230 

 Stegosaurus, 433 

 Stenson's canal, 479 

 sternebrae, 140 

 sternum, 138 



sternum, morphology of, 139 

 sternum of monotremes, 142 

 stoma, 266 

 stomach, 265, 290, 291, 292 



stomatodaeum, 259, 476 

 stomato-pharyngeal cavity, 266 

 stratum corneum, 77 

 stratum germinativum, 77 

 stratum lucidum, 77 

 stratum mucosum, 77 

 striated muscle, 189, 190 

 sturgeon, 29 

 stylo-hyal, 161, 284 

 stylo-hyoid ligament, 161 

 styloid process, 161, 284 

 sub-cutaneous lymph sacs, 358 

 subdural space, 357 

 sub-lingua, 284 

 sublingual glands, 285, 286 

 submandibular glands, 285, 286 

 submaxillary glands, 285, 286 

 submucosa, 260 

 subperitoneal space, 357 

 subvertebral space, 357, 363 

 sulci, of brain, 417 

 sulcus centralis, 417 

 superciliary structures, 505 

 supra-clavicles, 174 

 supra-cleithra, 174 

 suprapericardial bodies, ,288 

 Sus, 86, 489 



suspensorium of jaw, 155 

 sweat-glands, 112, 113 

 swine, 484, 491 

 Sycandra, 50 



sympathetic plexuses, 464 

 sympathetic system, 451, 463, 464, 

 symphysis pubic, 172 

 syntropists, 244 

 syrinx, 314. 



tactile cells, 473 



tactile corpuscles, 473 



tactile sense, distribution of, 475 



tactile spots, 473 



taania ventriculi quarti, 427 



taenise chorioides, 419, 420 



tail, 130, 132, 134, 135 



tail, nerves of, 431, 432 



talon, 279 



Talpa, 277 



tapetum nigrum, 423 



tapir, 394 



tarsal cartilages, 504 



tarsal glands, 113, 505 



