INDEX 



Sea-snakes, 312, 339 



Sea-squirts, 20 



Sea-turtles, 341, 342 



Seals, 60, 475, 485, 516, 537, 550 



Sebaceous glands, 461, 463 



Sebastes percoides, 206 



Secodont, 529* 



Secretary-bird, 388, 594 



Segmentation of vertebrate head, 100 



Selache, 173 



Selachii, 156* 



Selenodont, 529* 



Sella turcica, 72* 



Semicircular canals, 108* 



Semi-plumes, 395* 



Semnopitheciis, 575 



Sense- vesicle, 29, 32 



>ensory organs: Amphioxiis, 49: Craniata, 

 100 See Ear, Eye, Lateral line, Olfac- 

 tory organ 



Septum lucidum, 440* 



Serous membrane, of Birds, 412 ; Mam- 

 malia, 557, 560 



Serranus, 224 



Severino, 629 



Sexual cells, centrifugal influence of, 626 



Sexual selection, 618* 



Shaft of long bone, 77* 



Shagreen, 158 



Shags, 387 



Shank, See Hind-limb 



Sharks, 134, 156, 157, 172, 173 



Shearwaters, 387 



Sheep, 453, 472, 507, 565 



Shell of Chelonia, 317 



Shell-gland, Dogfish, 151: Elasmobranchs, 

 166 



Shell-membrane, 407 



Shore-fishes, 211 



Shoulder-girdle See Pectoral arch 



Shrews, 457 



Siebold, 642 



Silurian period, 603 



Siluroids, 205, 213, 217, 220, 222, 226 



Simia, 460, 575 



Simla satyrus, 524 



Simiidtr, 459*, 478, 520, 522, 523, 566 



Sinus rhomboidalis, 378* 



Sinus venosus See Heart 



Siphonops, 281 



Siren, 272, 274, 275 



Sirenia, 451*, 462, 472, 479, 480, 535, 

 543, 548, 564, 571 



Skates, 157 



Skeletogenous layer, 66* 



Skeleton of Craniata See Skull, Verte- 

 bral column, Ribs, Sternum, Pectoral 

 arch, Pelvic arch, Limb-skeleton 



Skin, Craniata, 62, 63* 



Skincs, 312, 318, 339, 342 



Skull of Craniata, 68, 70, 73 : Petromy- 

 zon, 117, 118, 119 : Myxinoids, 130, 

 131: Chiloscyllium, 137, 138, 139: 



Elasmobranchii, 159 : Holo t ,hali J7o 

 177, 178: Trout, 187, 188,189.193: 

 Teleostomi, 214 : Ceratodus. 231. 232 : 

 Frog, 249, 250: Amphibia. 279 281 : 

 Lizard, 295, 296 : Reptilia, ::_;:. 324 

 328 : Pigeon, 359 : Birds. 399-401 : 

 Rabbit, 421, 423: Mam lia, 480: 

 Prototheria, 485, 486, 487 : Myt-. 

 489, 490492 : Edentata. 494, 495 : 

 Cetacea, 500, 501 : Sirenia, 503 : U 

 gulata, 505, 507, 508 : Carnm., 

 Rodentia, 515 : Insectivora, 517 

 ptera, 518, 520: Primate; 

 523 



Sloane, H., 636 



Sloths, 450, 461, 467, 483, 4C :. >V iW, 

 497, 498, 532, 541, 564 



Smelt, 205, 223 



Smith, William, 639 



Snakes, 60, 312, 316, 319, 320, .'524, 3-J9- 

 330, 331, 335, 339, 340, 342 



Snakes, venomous, 340 



Soft palate, 430*, 538* 



Soft tortoises, 313, 319 



Solander, 636 



Sole, 183, 205, 225 



Solitaire, 388, 398, 402 



Somatic nerves, 93 



Soricidce, 457 



Souleyet, 643 



South American Ostrich See I 



Spallanzani, 634 



Sparrmann, 636 



Spencer, Herbert, 643 



Spermatists, 631 



Spermatophores, of Holocephali 

 Amphibia, 288 



Sperm-sac, of Elasmobranchii, 1(>7 



Sperm Whales, 450, 451, 535 



Sphenethmoid, 250 



Spheno-maxillary fissure, 522* 



Sphenotic, 190 



Spider Monkeys, 459 



Spinal cord, of Amphioxus, 48 

 92,93 



Spines, Spinous fin-rays of Teleostomi, 

 210 



Spiny Anteater See Echidna 



Spiracle, of Chiloscyllium, 136 : T 

 stomi, 209 



Spiracular gill, 164* 



Spiral valve 6f Petromyzon, 121: ' 

 scy Ilium, 142 : Elasmobraix 

 Teleostomi, 218 



Splanchnic nerves, 93* 



Spleen, 82* 



Splenial, 298* See Skull 



Splenium, 440*, 546* 



Spontaneous generation See Abioger 



Spoonbills, 387, 392 



Squalida, 156* 



Squcdodon, 571 



Squatodontidce, 451, 571 



