INDEX 



469 



(Amphinxus, pages 1-61; frog, 62-228; 



skull, 164, 210, ff.: 354; - - bony 

 elements of, 215; - - cartilag- 

 inous, 210 ff. 



solenocytes, 45, 53 



somatic stalk, 282 



somatopleure, 174: 266-267, 280 



somites, 21, 25, 25, 29 ff., 30, 32, 51 

 ff.: 124, 170 ff., 171: - -264$, 

 266, 268, 274, 278: 352 ff.: 401, 

 402 ff.; - - number of, 51: 172: 

 264, 352; - - of head, 264-265; 



table of, 173 



space, perivitelline, 4, 5, 9, 10: 80, 

 81: 374 



spawning, 8, 58: 64, 71, 77 ff. 



spermatogenesis, 77 



spermatogonia, 7 



spermatozoon, 5: 70, 71; - - lon- 

 gevity of ,379 ; supernumerary, 

 246 



spermophile, implantation, 422, 423 



spinal, bulb, 129: 308; - - cord, 37: 

 117, 118, 134, 134: 308; 

 ganglia, 135, 142, 143: 309, 311; 

 nerves, 135, 142-143, 143, 

 173: 311 ff., 312; nerves, 



axons of, 311 



spiracle, 67, 161: 315, 330 



splanchnic stalk, 282, 289, 327, 334 



splanchnoccel, 25, 31, 52 : 124,124, 170 



splanchnopleure, 174: 266-267, 280 



spleen, 191: 350 



stalk, allantoic, 287, 288, 289, 296, 

 297, 297, 348: 430, 431; 

 body (belly), 399, 400, 429, 430, 

 446; - - optic, 129, 144, 145, 147, 

 148, 160: 303, 316, 317, 318, 320; 

 somatic, 282; splanchnic, 

 282, 289, 327, 334 



stapes, 325 



sternum, 221 



stigma, follicular, 378 



stomach, 168, 169: 332, 335, 351 



stomach-intestine, 33 



stomodaeum, 158, 164, 166 : 269, 327, 

 329: 404, 412, 412 



Strahl, 439 



stratum granulosum, 375, 376 



streak, primitive, 119, 120: 251 ff., 

 252, 254, 258, 260, 274: 394, 395, 

 396, 398, 401 ; - - relation 



to embryo, 256$., 258, 260 



stroma, ovarian, 205: 361, 362 



subatrial ridges, 48, 48 



subgerminal cavity, 245, 245, 248 



subnotochordal rod, 169, 204 



subzonal layer, 382, 383, 385, 385 



sucker, oral, 65, 66, 120, 164, 180 



supra-orbital folds, 413, 414 



suprapericardial body, 163, 164 



chick, 229-367; mammal, 368-454.) 



suprascapula, 221 



suspensory fold, 49 



suture, cerebral, 274, 276 



swelling, genital, 415, 416, 417 



Sylvius, aqueduct of, 132: 307 



symmetry, of blastula, 96; - - of 

 ovum, 4, 6, 10, 11, 17: 70, 80, 83 

 $.,87,88$. 



sympathetic, cords, 143, 143 : 312- 

 313, 313; - - ganglia 144: 207, 

 207: 364; - nervous system, 

 143-144, 143: 312-313, 313" 



synccelom, 32 



syncytia, trophodermal, 422 ff. 



syncytiotrophoblast, 390, 422 ff., 

 423 



syncytiotrophoderm, 4,22 ff., 423 



synencephalon, 304 



systemic arch, 184, 184: 341, 342 



Tadpole, 63 ff.; metamor- 



phosis of, 67-68 



tail, 65, 120, 120 : 404, 406, 406, 408, 

 408, 409, 409 ; - - bud, 279, 280, 

 283, 296, 296, 297 ; - - fold, 280, 

 293, 296, 296, 297 ff., 297 



Talpa, see mole. 



tapir, placentation, 440 



Tarsi us, amnion folds-, 428; embry- 

 onic shield, 387; placentation, 440; 

 yolk-sac, 433 



teeth, 220; - - vestiges, 328 



"teeth" (horny), 159, 166 



telencephalon, 129, 133: 283, 303$'., 

 304 



temperature, of incubation, 231 



tentacles, velar, 44, 45 



terminal sinus, see sinus. 



testis, 6: 72, 73, 77: 362 



thalami, optic, 129, 148: 307, 320 



thoracic duct, 191 : 349 



thymus, 162, 163: 330, 331 



thyroid body, 163, 165, 166 : 304, 331, 

 331 



tongue, 165: 332; - - bar, 41, 42 



torus transversus, 129, 131, 133 : 305 



trabeculse, 210, 211, 212, 213 



trabecular cornu, 210, 211, 212, 215 



trachea, 329 



"Trager," 389, 391, 429 



transverse process, 209 



trophoblast, 382, 384, 385 ff., 385, 



386,388,390,421,423; knob, 



389 



trophoderm, 397, 422, 447; 



functions of, 422-423; - - syn- 

 cytium, 422 ff.; - - vasculari- 

 zation of, 423 



truncus arteriosus, 177, 178, 184, 185: 

 282, 338, 339 



