636 INDEX. 



Second week : Mem, 472-486 



Secondary gill-slits : Amphioxns, 76-78 



Secondary sulci : Man, 519-520 



Segmental duct : Frog, 186-190, 1 93-194 



Segmentation of egg : 14-15, 17-22, 37 ; AmpUoxus, 49-52 ; Frog, 100-104 ; 



Chieli, 232-235; iiaJJJi, 352-354 ; Man, 471-472 

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

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

 Semicircular canal : Frog, 141 ; EaiUt, 393, 395 ; Mam, 541-542 

 Semilunar valve : Chich, 302 ; Babbit, 416 ; Man, 573 

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

 Sense organs: Frog, 134-145; Chiok, 274-281; Babbit, 387-399; Mam, ■ 



538-544 

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

 Sensory roots of spinal nerves: Amphioxm, iS ; Frog, 127-128; Chick, 271- 



273 ; Babbit, 385-386 ; Mom, 525-528 

 Separation of placenta : Babbit, 444 ; Man, 614 

 Septum inferius : Man, 571, 573 

 Septum narium : Man, 555 

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



Mam, 571-572 

 Septum spurium : Mam,, 570 

 Septum auperius : Man, 569 

 Seventh month : Mail, 507-508 



Sex, origin of : 34-35 



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



Shell membrane : JTen, 220, 229 



Sinus prjecervicalis : Mam,, 495, 502, 553, 559 



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



Sinus venosus : Frog, 168, 183 ; Chick, 309 ; Babbit, 413, 414 ; Man, 568, 679 



Sinuses of placenta: Man, 612, 614 



Sixth month : Man, 507 



Sixth week : Man, 501-503 



Size of eggs : 342 



Skeleton: Frog, 198-215; Chick, 324-835; Babbit, 429-433 



Skin : Babbit, 433-434 



Skull: i?Vo.9, 201-210; CAic*, 328-332 ; iJaiJii, 432-433 



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



Somatopleure : Chick, 243 



iSomite: Amphioxw, 60-61, 65-69, 84-87; Chick, 244 



Spawn : Frog, 91, 99 



Spawning period : Amphioxus, 4G ; Frog, 90 



Spee's embryo : Jlfow, 479-481 



Spermatozoon: 12, 13; Amphioxus, ii ; Frog, ^^-100 ; Chick, 232; Man, 466 



Sphenoidal sinus : Man, 538 ' 



Spina vestibuli : Man, 569-571 



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



Spinal neirves: Frog, 128; Chick, 271-274 ; Babbit, 385-386 ; Ma/n, 521-528 



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



Splanchnocoel : Amphioxus, 85-86 



Splanchnopleure : Chick, 243 



Spleen : Frog, 185 



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



Spongioblast: Man, 523-524 



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



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



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



Stomatodffium: Frog, 145, 148-149; C/«ci, 259, 281, 286-289; Babbit, 400 

 Man, 482, 490, 492, 545 



Stratum compactum of deoidua : Man, 610 



Stratum spongiosum of decidua : Man, 610 



