692 



INDEX. 



Polynesia, 177 

 Polynoe, 313 

 Polynqidae, 313 

 Polyodon, 573 

 Polyodontidae, 573 

 Polyp, 230 

 Polyphemidas, 417 

 Polypid, 322 

 Polypodium, 239, 241 

 Polyprododonta, 633 

 Polypterus, 573 

 Polypterus tail, 41 

 Polyscelis, 271 

 Polyspermy, 148 

 Polystomeae, 273 

 Polystomella, 198 

 Polystomum. 273, 274 

 Polythalamia, 196, 198 

 Polytroche, 309 

 Polyzoa, 321 

 Poneridge, 487 

 Pons Varolii, 623 

 Pontobdella, 321 

 Pontodrilus, 308 

 Pontella, 421 

 Porcellanidae, 437 

 Porcellain crabs, 437 

 Porcellio, 442 



Torcellio, nervous system of, 124 

 Porcupines, 639 

 Pore'lla, 324 

 Pori abdominales, 546 

 Porifera, 221 

 'Porites. 261 

 Porpita, 245 

 Portal vein, 548 

 Portuguese man-of-war, 245 

 Portunidae, 437 

 Porus branchialis, 503 

 Postabdomen. 401 

 Postfrontal bone, 526, 590 

 Postorbital bone, 590 

 Postpermanent dentition, 625 

 Potato beetle, 485 

 Powder down, 603 

 Praeclavia, 528. 622 

 Praecoces, 612 

 Prairie dogs, 639 



Praya, 166, 244 

 Prefrontal bone. 526, 590 

 Prelacteal dentition, 625 

 Premaxillary "bone, 525 

 Premolar teeth, 626 

 Presphenoid bone, 522 

 Priapuloidea, 317 

 Priapulus, 317 

 Primaries, 604 

 Primary bone, 519 

 Primary yolk, 80 

 Primates, 649 

 Primnoa, 259 

 Primordial cranium, 521 

 Principal tissue, 99 

 Priodon, 635 

 Pristidae, 572 

 Pristis, 572 

 Proboscidia, 643 

 Proboscis, 373 

 Procoelous, 519 

 Procoracoid, 528 

 Proctodaeum, 104 

 Procyon, 647 

 Proechidna, 631, 632 

 Proglottids, 278 

 Profeet, 466 



Progression, principle of, 55 

 Prolegs, 475 

 Promorphology, 133 

 Pronephric duct, 550 

 Pronephros, 550 

 Prong horn, 643 

 Pronotum, 462 

 Pronucleus, 149 

 Proofs of phylogeny, 32 

 Proostracum, 389 

 Prootic bone, 522 

 Propodium, 369 

 Propterygium, 529 

 Prorostomus, 644 

 Prosencephalon, 533 

 Prosimiae, 648 

 Prosobranchia, 378 

 Prosternum, 528 

 Prostoma, 156 

 Protamoeba, 189 

 Proteroglypha, 601 



