636 INDEX. 



Second week : Man, 472-486 



Secondary gill-slits: Amphioxus, 76-78 



Secondary sulci : Man, 519-520 



Segmental duct : Frog, 186-190, 193-194 



Segmentation of egg: 14-15, 17-22,27; Amphloxus, 49-52: Frog, 100-104; 



Chick, 232-235; Rabbit, 352-354 ; Man, 471-472 



Segmentation cavity : Amphioxus, 51-52 ; Frog, 103, 108-10'.) ; Chick, 234 

 Segmentation nucleus : 13, 14; Frog, 100, 102 

 Semicircular canal : Frog, 141 ; Babbit, 393, 395 ; Man, 541-542 

 Semilunar valve : Chick, 302; Rabbit, 416; Man, 573 

 Sense capsule : Frog, 204-205 ; Chick, 328-330 

 Sense organs: Frog, 134-145; Chick, 274-281; Rabbit, 387-399; Man, 



538-544 



Sensory cranial nerves : Man, 528- 530, 534-538 

 Sensory roots of spinal nerves: Amphioxus, 43 ; Frog, 127-128; Chick, 271- 



273 ; Rabbit, 385-386 ; Man, 525-528 

 Separation of placenta : Rabbit, 444 ; Man, 614 

 Septum inferius : Man, 571, 573 

 Septum narium : Man, 555 

 Septum of truncus arteriosus : Frog, 168 ; Chick, 301, 302, 305 ; Rabbit, 416 ; 



Man, 571-572 



Septum spurium : Man, 570 

 Septum superius : Man, 569 

 Seventh month : Man, 507-508 

 Sex, origin of : 34-35 



Sexual differentiation: Frog, 95; Rabbit, 346; Man, 453 

 Shell membrane : Hen, 220, 229 

 Sinus praecervicalis : Man, 495, 502, 553, 559 

 Sinus terminalis : Chick, 310; Rabbit, 368, 420; Man, 483 

 Sinus venosus : Frog, 168, 183 ; Chick, 309; Rabbit, 413, 414; Man, 568, 579 

 Sinuses of placenta: Man, 612, 614 

 Sixth month: Man, 507 

 Sixth week : Man, 501-503 

 Size of eggs : 342 



Skeleton : Frog, 198-215 ; Chick, 324-335 ; Rabbit, 429-433 

 Skin : Rabbit, 433-434 



Skull: Frog,2Q\-2\Q; Chick, 328-332 ; Rabbit, 432-433 

 Somatic layer of mesoblast : Chick, 243 ; Rabbit, 427 

 Somatopleure : Chick, 243 



Somite: Amphioxus, 60-61, 65-69, 84-87; Chick, 244 

 Spawn: Frog, 91, 99 



Spawning period : Amphioxus, 46 ; Frog, 90 

 Spec's embryo : Man, 479-481 



Spermatozoon: 12, 13; Amphioxus, 44 ; Frog, Q9-1QQ ; Chick, 232; Man, 466 

 Sphenoidal sinus : Man, 538 

 Spina vestibuli : Man, 569-571 



Spinal cord : Frog, 116-117 ; Chick, 249-252 ; Rabbit, 381 ; Man, 521-528 

 Spinal nerves: Frog, 128; Chick, 271-274 ; Rabbit, 385-386 ; Man, 621-528 

 Splanchnic layer of mesoblast : Chick, 243 ; Rabbit, 427 

 Splanchnoccel : Amphioxiis, 85-86 

 Splanchnopleure : Chick, 243 

 Spleen : Frog, 185 



Splitting of mesoblast: Chick, 243-244, 246; Rabbit, 427 ; Man, 483 

 Spongioblast : Man, 523-524 



Stapes : Frog, 204, 209 ; Chick, 330 ; Rabbit, 398 

 Sternum : Frog, 213 ; Chick, 332 ; Rabbit, 432 

 Stomach : Chick, 290; Rabbit, 403 ; Man, 545, 546, 548 

 Stomatodajum : Frog, 145, 148-149; Chick, 259, 281, 286-289; Rabbit, 400 



Man, 482, 490, 492, 545 

 Stratum compactum of decidua : Man, 610 

 Stratum spongiosum of decidua: Man, 610 



