5 66 



INDEX 



pituitary body, 424 



placenta, 34, 70, 71, 72, 73, 377, 388 



placoderms, 29, 83, 524, 525 



placoid scales, 80, 81, 267 



placoid scales on teeth, 154 



plasma, 318, 319 



plastron of turtles, 105 



platyhelminths, 520 



Platyrrhini, 278 



Pleisiosaurus, 185 



pleura, 66, 316 



pleurapophyses, 138, 508, 510 



pleuro-peritoneal cavity, 64, 66 



plexus, blood vessels in brain, 413, 



419, 420 



plexus brachialis, 438, 439-441 

 plexuses, chorioid, 413, 416, 419, 420 

 plexuses, of nerves, 438 

 plexuses, sympathetic, 464 

 plexus formation, nerves, 438 

 plexus lumbo-sacralis, 438 

 plica fimbriata, 284 

 plica semilunaris, 504 

 pneumatic cyst, 310, 311 

 poikilothermous animals, 356 

 poison fangs of serpents, 280 

 polar globules, 56, 57 

 Polypterus, 171, 186, 187, 188, 311 

 Polypterus, ribs of, 137 

 polyspermy, 53 

 pons Varolii, 426, 427 

 Pontoporia, 301 



pori abdominalis, 369, 380, 381 

 porpoise, 478, 491, 505 

 postbranchial bodies, 288, 289 

 posterior limb, 169 

 posterior nares, 269, 478 

 post-minimus, 182, 242 

 praechordal elements, 144, 145 

 praechordal portion of head, 460 

 praechordal region of head, 124, 144 

 pre-hallux, 182 

 prehistoric man, 42 

 premolars, 275 

 pre-pollex, 182, 242 

 preputial glands, 113, 403 

 Prevertebrata, 26 

 primary body cavity, 365 

 Primates, 38, 40, 41, 90, 91, 92, 93, 



165, 175, 216, 223, 238, 250, 277, 



291, 394, 402, 417 

 Primates, limbs, 239 



primitive dentition, 277 



primordial brain, 411 



primordial skull, 145 



Proboscidea, 38, 39 



Procavia, 38 



processus vaginalis, 395 



precocious vertebrae, 131 



procoracoid, 174 



proctodaeum, 259 



pronephridia, 371 



pronephros, 37<>373 



pronephrotic duct, 370 



pronephrotic tubules, 371, 374 



Propithecus, 300 



propterygium, 176, 185-187 



prosencephalon, 411 



prostate gland, 403 



prostatic vesicle, 393, 394 



Proteus, 231, 247, 300, 312, 313 



Protochordata, 26 



protocoele, 63, 64, 365, 367 



protocone, 278 



protoplasm, characteristics of, I 



protostome, 59, 61 



Prototheria, 35 



Protozoa, 3, 257 ; immortality of, 5 ; 



conjugation of, 6 

 pseudohypertrichosis, 99 

 Pterichthys, 524 

 Pterodactyl, 183, 184 

 pterygoid canal, 450 

 pubic bones, 172 

 pubo-ischiadic symphysis, 172 

 pulmonary system, 260, 270, 304, 



308, 310-316 

 pulsating vessels, 317 

 pyloric coeca, 266 

 pyloric end of stomach, 291 

 pylorus, 265, 291 



R 



rabbit, 297, 334, 345, 346, 491 



race history, 15 



Rana, 313, 489, 526 



Ranodon, 186 



rat, 336, 338 



ratio of surface to mass, 3, 261, 262 



ray, 453 



receptacula chyli, 362 



recessus utriculi, 487 



rectum, 298, 389 



red blood corpuscles, 318, 364 



