INDEX 



679* 



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 



Secoclont, 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* 



Semnopiihecus, 575 



Sense-vesicle, 29, 32 



Sensory organs: Amphioxus, 49: Craniata, 

 100 See Ear, Eye, Lateral line, Olfac- 

 tory organ 



Septum lucidum, 440* 



Serous membrane, of Birds, 412 ; Mam- 

 malia, 557, 560 



Serranu-y, 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 



Simla, 460, 575 



Simia satyriis, 524 



Simiid*, 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 : Chiloscy Ilium, 137, 138, 139 : 



Elasmobranchii, 159 : Holoccphali, 175, 

 177, 178 : Trout, 187, 188, 189, 193 : 

 Teleostomi, 214: Ceratodus, 231, 232: 

 Frog, 249, 250 : Amphibia, 279281 : 

 Lizard. 295, 296 : Reptilia, 323, 324- 

 328 : Pigeon, 359 : Birds, 399401 : 

 Rabbit, 421, 423 : Mammalia, 480 : 

 Prototheria, 485, 486, 487 : Metatheria, 

 489, 490492: Edentata, 494, 495: 

 Cetacea, 500, 501 : Sirenia, 503 : Un- 

 gulata, 505, 507, 508 : Carnivora, 513 : 

 Rodentia, 515 : Insectivora, 517 : Chiro- 

 ptera, 518, 520: Primates, 520, 521 , 

 523 



Sloane, H., 636 



Sloths, 450, 461, 467, 483, 493, 495, 496, 

 497, 498, 532, 541, 564 



Smelt, 205, 223 



Smith, William, 639 



Snakes, 60, 312, 316, 319, 320, 324, 329 

 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 Rhea 



Spallanzani, 634 



Sparrmann, 636 



Spencer, Herbert, 643 



Spermatists, 631 



Spermatophores, of Holocephali, 179, 181 : 

 Amphibia, 288 



Sperm-sac, of Elasmobranchii, 167 



Sperm Whales, 450, 451, 535 



Sphenethmoid, 250 



Spheno-maxillary fissure, 522* 



Sphenotic, 190 



Spider Monkeys, 459 



Spinal cord, of Arityhioxus, 48 : Craniata, 

 92,93 



Spines, Spinous fin-rays of Teleostomi, 

 210 



Spiny Anteater See Echidna 



Spiracle, of Chiloscyllium, 136 : Teleo- 

 stomi, 209 



Spiracular gill, 164* 



Spiral valve of Petromyzon, 121: Chilo- 

 scyllium, 142 : Elasmobranchs, 164 : 

 Teleostomi, 218 



Splanchnic nerves, 93"" 



Spleen, 82* 



Splenial, 298* See Skull 



Splenium, 440*, 546* 



Spontaneous generation See Abiogenesis 



Spoonbills, 387, 392 



Squalida, 156* 



Squalodon, 571 



Squcd 'odontidn*, 451, 571 



