INDEX 



723 



Seps, 365 



Septum auiioularum, 278, 279*, 305 



Septum lucidum, 470 



Serous membrane, of Birds, 441, 442 : 

 Mammalia, 476 



Serpentariug, 630 



Serramis, 241 



Sesamoid bone, 393* 



Severino, 669 



Sexual selection, 656* 



Shaft of long bone, 84* 



Shagreen, 171 



Shags, 415, 422 



Shank, 69 — See Hind-limb 



Sharks, 169-188 



Shearwaters, 368, 415 



Sheep, 482, 501, 539, 571, 598 



Shell of Chelonia, 341 ; of Pigeon, 408 



Shell-gland, Dogfish, 164, 165 : Elasmo- 

 branchs, 180 



Shell-membrane, 408, 435 



Shore-fishes, 227 



Shoulder-girdle — See Pectoral arch 



Shrews, 485, 507 



Siamanga, 631 



Siebold, 682 



Silurian period, 639 



Siluroids, 220, 227, 228, 232, 233, 236, 

 238, 241, 243 



Simia, 631, 487 



Simia aatyrus, 566, 557 



Simiidte., 487*, 509, 552, 554, 600 



Sinuses, 93, 156* 



Sinus rhomboidalis, 405 



Sinus venosus, 90— See Heart 



Siphons, oral and atrial, of Ascidia, 15, 

 16 



Siredon, 312 



Siren, 293, 295, 296, 305 



Sirenia, 480*, 490, 501, 510, 511, 534, 535, 

 536, 568, 576, 581, 598, 606 



Siren lacertina, 295 



Skates, 170 



Skeletogenous layer, 73* 



Skeleton of Craniata — See Skull, Verte- 

 bral column. Ribs, Sternum, Pectoral 

 arch. Pelvic arch. Limb-skeleton 



Skin, Craniata, 69 



Skincs, 334, 342, 365, 369 



Skull of Craniata, 76, 76, 77, 78, 79, 80 : 

 Petromyzon, 126, 126, 127 : Myxinoids, 

 140: Dogfish, 147, 148: Elasmo- 

 branchii, 172, 173, 174: Holocephali, 

 190, 192, 193: Trout, 202, 203, 204, 206, 

 206 : Teleostomi, 230 : Ceratodus, 248, 

 249: Frog, 268, 269: Amphibia, 299, 

 300, 301, 302 : Lizard, 317, 318, 319 : 

 Reptilia, 347-353 : Pigeon, 388, 389 : 

 Arohaeopteryx, 419 : Birds, 427-429 : 

 Rabbit, 449-464 : Mammalia, 511, 612: 

 Prototheria, 617, 518, 619 : Metatheria, 

 521-624 : Edentata, 586, 627 : Cetacea 



632, 633 : Sirenia, 539 ; Ungulata, 537- 



540 : Carnivora, 545, 546 : Rodentia, 



548 : Insectivora, 549 : Chiroptera, 



550, 561 : Primates, 552-555 

 Slime-Eels, 13S 

 Sloane, H., 676 

 Sloths, 479, 488, 497, 498, 510, 513, 516, 



525, 526, 527, 528, 629, 530, 564, 573, 



598 

 Smelt, 220, 240, 640 

 Smith, William, 679 

 Snakes, 335 — See Ophidia 

 Snakes, venomous, 367 

 Soft palate, 459*, 570 

 Soft tortoises, 336, 342 

 Solander, 676 

 Sole, 183, 196, 221, 241 

 Solenooytes, 52, 53 

 SoUnodon, 634 



Solitaire, 416, 417, 426, 430, 642 

 Somatic motor fibres, 116* 

 Somatic nerves, 99* 

 Somatic sensory fibres, 116* 

 Soricidce, 485, 507 

 Souleyet, 683 



South American Ostrich — See Rhea 

 Spallanzani, 674 

 Sparrmann, 676 

 Spelerpes, 299 

 Spencer, Herbert, 683 

 Spermatic artery, 92 : vein, 94 

 Spermatists, 671* 

 Spermatophores, of Holocephali, 196, 



196 ; Amphibia, 308 

 Sperm-sac, of Elasmobranchii, 165, 180 

 Sperm Whales, 480, 516, 567 

 Sphargis, 347, 368, 370 

 Sphenethmoid, 269 

 Sphenodon punctatum, 335, 339, 340, 343, 



344, 345, 347, 349, 353, 356, 861, 362, 



368, 369 

 Sphenoidal fissure, i5'Z 

 Spheno-maxillary fissure, 554* 

 Sphenotic, 204, 205 

 Sphyma, 170 

 Spider Monkeys, 487 

 Spigelian lobe, 674* 

 Spinal accessory nerve, 331 

 Spinal column— See Vertebral column 

 Spinal cord, of Urochorda, 35 : Amphi- 



oxus, 54 : Craniata, 98, 99 

 Spinal nerves of Craniata, 98 

 Spines, Spinous finrays of Teleostomi, 



225 

 Spiny Anteater, 478 — See Echidna 

 Spiracle, of Dogfish, 146 : Teleostomi, 



225 

 Spiracular cartilage, 173, 174 

 Spiracular gill, 154*, 178 

 Spiral valve of Petromyzon, 130, 134 : 

 Dogfish, 152, 153 : Elasmobranchs, 178: 

 Teleostomi, 218 : Ceratodus, 250 



