INDEX 



589 



Pristiiirus — 



heart, 366 



lens, 139 



motor nerve-trunk, HI 



nvuscle-buds, 208 



opisthonephros, 248, 250 



origin of mesoderm, 63 



ostium tubae, 243 



segmentation, 14, 15 

 Proamnion, 467 

 Proctodaeiun, 144 



Pronephrio chamber, secondary, 231, 236 

 Pronephros, 221, 222-237 



in adult Teleosts, 235 

 Protonephridium, 21S 

 Protopterus — 



buccal cavity, 149 



chondrocranium, 308, 309, 311 



larva, renal organs, 230 



lung, 169, 190 



olfactory organ, 125, 126 



otocyst, 131 



pancreas, 190 



Pinkus's organ, 133 

 Protostoma, 31 



theory, 493 

 Protostylic skull, 320 

 Protovertebrae, 59 

 Protovertebral stalk, 198 

 Pseudobraneh, 159 

 Pulmonary artery, 402 

 Pyloric caeca, 191 

 Pyriform lobe, 91 



Radial segmentation, 9 

 Raia (Skate) — 



electrical organ, 213, 214, 216 



embryos. 562 



practical hints, 560 

 Rana — 



buccal cavity, 148 



calcareous bodies, 132 



cement-organs, 80 



ciliation of ectoderm, 70 



egg-envelopes, 459, 460 



eye, 140, 141 



gastrulation, 38, 40 



heart rudiment, 361 



larval teeth, 76 



origin of mesoderm, 61, 62 



renal organs, 222, 223 



segmentation, 10, 11, 12, 13, 28 

 Recapitulation, 490, 505 

 Recess (of labyrinth), 129 

 . Rectal caecum, 192 

 Renal ducts, evolutionary origin, 264 



organs, general, 217, 261 

 Reptilia — 



aortic arches, 395, 396, 397 



archenteron, 51 



egg-tooth, 326 



embryologieal material, 570 



gastrular lip, 49 



Reptilia (continued) — 

 gastrulation, 47 

 opisthonephros, 260 

 origin of mesoderm, 64 

 pronephros, 238 

 vertebral centra, 301 

 viviparity, 480 



Retina, 135, 137 



Rhacophorus, 461 



Rhinoderma, 462 



Rhodeus, air-bladder, 167 



Rhombencephalon, 85, 89 



Rhomboidal sinus, 525 



Eibs, 302 



Saccule, 130 



Salamandra (Salamander) — 

 heart, 389 

 opisthonephros, 252 

 rib, 304 

 tongue, 150 

 venous system, 421 

 vertebral centra, 300 

 viviparity, 480 

 Salmo — 



air-bladder, 168 

 egg, 20 

 gonad, 267 

 heart, 389 

 lepidotrichia, 347 

 opisthonephros, 259 

 ovary, 277 

 pronephros, 234 

 pseudobraneh, 159 

 segmentation, 21, 22 

 Sarcoplasm, sarcolemma, 203 

 Sauropsida — 

 lung, 162 

 segmentation, 29 

 Scales, cycloid, 336 

 ganoid, 336 

 of Birds, 73 

 placoid, 321, 322 

 Reptilian, 71 

 Schneiderian folds, 128 

 Sclerotic, 139 

 Sclerotome, 67, 198, 205, 285, 286 



538 

 Scyllium — 



chromophile organs, 284 

 elongated buccal opening, 147, 148 

 interrenal, 283 

 practical hints, 561 

 segmentation, 14, 15 

 vertebral centra, 298 

 Segmentation, 5 



abortive, 14, 29 

 cavity, 7 

 metameric, 500 

 of coelome, 197, 199 

 of head region, 500, 501 

 Semicircular canals, 129 

 Sero-amniotic connexion, 469 



