INDEX. 



791 



Semicircular canals, 519 



Sense organs, comparative account of 

 development of, 304 



Septum lucidum, 443 



Serous membrane, Lacerta, 209; of Rab- 

 bit, 237 



Seventh nerve, development of, 459 



Shell-gland of Crustacea, 689 



Shield, embryonic, of Chick, 151 ; of 

 Lacerta, 202 



SimiadiK, placenta of, 247 



Sinus rhomboidalis, of Chick, 162 



Sinus venosus, 637 



Sirenia, placenta of, 255 



Sixth nerve, 463 



Skate, mandibular and hyoid arches of, 



577 



Skeleton, elements of found in Verte- 

 brata, 542 



Skull, general development of, 564 ; his- 

 torical account of, 564 ; development of 

 cartilaginous, 566; cartilaginous walls 

 of, 570; composition of primitive car- 

 tilaginous cranium, 565 



Somatopleure, of Chick, 170 



Spelerpes, branchial arches of, 142 



Spermatozoa, of Porifera, 741; of Verte- 

 brata, 746 



Sphenoid bone, 595 



Sphenodon, hyoid arch of, 588 



Spinal cord, general account of, 415; 

 white matter of, 415; central canal of, 

 417, 418; commissures of, 417; grey 

 matter of, 417; fissures of, 418 



Spinal nerves, posterior roots of, 449; 

 anterior roots of, 453 



Spiracle, of Elasmobranchii, 62 ; Acipen- 

 ser, 105; Amphibia, 136 



Spiral valve. See 'Valve' 



Spleen, 664 



Splenial bone, 595 



Squamosal bone, 593 



Stapes, 529; of Mammal, 590 



Sternum, development of, 562 



Stolon of Doliolum, 29 ; Salpa, 33 



Stomodaeum, 774 



Stria vascularis, 524 



Styloid process, 591 



Sub-intestinal vein, 65 1 ; meaning of, 



651 



Syngnathus, brood-pouch of, 68 

 Subnotochordal rod, of Elasmobranchii, 



54; Petromyzon, 94; Acipenser, no; 



Lepidosteus, 115; general account of, 



754; comparison of with siphon of 



Chsetopods, 756 



Subzonal membrane, 237; villi of, 236 

 Sulcus of Munro, 432 

 Supraclavicle, 600 

 Suprarenal bodies, 664 

 Supra-temporal bone, 593 

 Swimming bladder, see Air bladder 

 Sylvian aqueduct, 428 

 Sylvian fissure, 444 

 Sympathetic ganglia, development of, 467 



Tadpole, 134, 139, 140; phylogenetic 

 meaning of, 137; metamorphosis of, 

 137; m can ing of suctorial mouth of, 585 



Tail of Teleostei, 80; Acipenser, 109; 

 Lepidosteus, 109; Amphibia, 132 



Tarsus, development of, 620 



Teeth, horny provisional, of Amphibia, 

 136; general development of, 776; 

 origin of, 777 



Teleostei, development of, 68; vivipa- 

 rous, 68; comparison of formation of 

 layers in, 286; restiform tracts of, 425 ; 

 mid-brain of, 425 ; infundibulum of, 

 431 ; cerebrum of, 439; nares of, 534; 

 lateral line of, 538; notochord and 

 membrana elastica of, 549 ; vertebral 

 column of, 553; ribs of, 561; hyoid 

 and mandibular arches of, 579; pec- 

 toral girdle of, 601 : pelvic girdle of, 

 606; limbs of, 618; heart of, 637; 

 arterial system of, 645; muscle-plates 

 of, 670; excretory organs of, 701 ; gene- 

 rative ducts of, 704, 735, 749; swim- 

 ming bladder of, 763 ; postanal gut of, 



Teredo, nervous system of, 414 



Test of Ascidia, 14; Salpa, 31 



Testicular network, of Elasmobranchs, 

 697 ; of Amphibia, 712 ; Reptilia, 723 ; 

 of Mammals, 724 



Testis of Vertebrata, 746 



Testis, connection of with Wolffian body, 

 in Elasmobranchii, 697; in Amphibia, 

 710; in Amniota, 723; origin of, 735 



Thalamencephalon of Chick, 175; gene- 

 ral development of, 430 



Third nerve, development of, 461 



Thymus gland, 762 



Thyroid gland, Petromyzon, 92 ; general 

 account of, 759; nature of, 760; de- 

 velopment of in Vertebrata, 761 



Tooth. See 1 Teeth' 



Tori semicirculares, 428 



Tornaria, 372 



Trabeculas, 565, 567; nature of, 568 



Trachea, 766 



Trematoda, excretory organs of, 68 1 



Triton alpestris, sexual larva of, 143 



Triton, development of limbs of, 619} 

 urinogenital organs of, 7 12 



Truncus arteriosus, 638; of Amphibia, 

 638; of Birds, 639 



Turiicata, development of mesoblast of, 

 293; test of, 394; eye of, 507; audi- 

 tory organ of, 530; olfactory organ of, 

 532; generative duct of, 749 ; intestine 

 of, 767; postanal gut of, 771; stomo- 

 dseum of, 775 



Turbellaria, excretory organs of, 68 1 



Tympanic annulus of *'rog, 587 



Tympanic cavity, of Amphibia, 135; 

 Chick, 1 80; Rabbit, 232; general de- 

 velopment of, 528; of Mammals, 591 



Tympanic membrane, of Chick, 180; 

 general development of, 528 



