700 



INDEX. 



Placoidei, 418. 

 Plaffiaulax, 6.R 641. 



Plagiostomi, 420 ; characters of, 421. 



Plan-irida. 191, 192, 2o2 



Planorbis. 333, 341. 



Plantigrada, 605, 608. 



Planula, 116. 



Plastron, 449, 450. 



Plataleadce, 510. 



Platanista, 578. 



Platycrinus, 173. 



Platydmia, 183 ; characters of, 184. 



Platyrhina, 630, 632. 



1'lecotus, 6-25. 



Plectognathi, 411. 



Plectropto-us, 485. 



PlesiosauTia, 473. 



Plesiosaiirus, 473, 474. 



Pleura, of Lobster, 222 ; of Trilobite, 239. 



Pleur acanthus, 429, 430. 



Pleurobrachia, 142 ; ctenophores of, 143 ; 

 canal-system of, 143, 144 ; development 

 of, 145 ; homologies of, 145. 



Pleurobrachiadce, 146. 



Pleurobranchidce, 336, 341. 



Pleurobranchus, 341. 



Pleuronectidce, 410, 423. 



Pleuronema, 83. 



Pleurotoma, 339. 



Pleurotomaria, 340. 



Pliolophus, 644. 



Pliopithecus, 648. 



Plotus, 505. 



Plough-share bone, 484. 



Plumaster, 182. 



Plumularia, 101. 



Pluteus, 156, 157. 



Plyctolophus, 521. 



Pueumatic filaments of Physopfioridce, 107. 



Pueumatocyst, 107. 



Pneumatophore, 107, 103. 



Pneumodermon, 343. 



Podarffus, 528. 



Podophthalmata, 226 ; characters of, 245. 



Podosomata, 258. 



Podura, 270, 278. 



Poephaga, 569. 



Polistes. 35. 



Polyarthra, 201. 



Polyccelia, 151. 



Polycystina, 67, 68. 



Polydesmus, 266. 



Polygastrica (of Ehrenberg), 78. 



Polypary, 93, 97, 98. 



Polype, 127. 



Polypide, 300. 



Polypidom, 89. 



Polypite, 89. 



Polyplectron, 516. 



Polypterus, 4 16. 



Polystome Infusoria, F3. 



Polythalamia (Foraminifera), 61, 62. 



Polytrema, 66. 



Polyxenia, 112. 



Polyzoa, 293, 294, 295; characters of, 29S ; 

 distinctions from Hydrozoa, 299 ; typi- 

 cal polypide of, 300 ; avicularia of, 

 301 ; lophophore of, 303 ; nervous system 

 of, 304 ; digestive system of, 303 ; repro- 

 duction of, 304 ; statoblasts of, 305 ; 

 development of. 16. ; relations to Tuni- 

 cata, 311 ; divisions of, 3J6 ; orders of, 



#>. ; distribution of, in space, 318 ; in 

 time, ib. 



Polyzoarium, 300. 

 Pontarachna, 260. 

 Pontia, 285. 

 Pontobdella, 209, 216. 

 Porambonites, 317. 

 Porcdlana, 249. 

 Porcellanous shells, 296. 

 Porcellia, 359. 

 Porcupine, 549, 619. 

 Pores of Sponges, 70, 71. 

 Porites, loO. 

 Poritid<e, 152. 

 Porpita, 107. 



Porpoise, 572, 573, 577, 578. 

 Portuguese man-of-war, 88, 103, 108, 109. 

 Potamides, 339. 

 Poulpe, 347, 351. 

 Pro'arcturus, 254. 

 Pi-ayo, 105. 

 Prayidce, 105. 

 Presbytis, 634. 



Press irostres, 508, 511. 



Prestwichia, 254. 



Priapulacea, 205. 



Primates, 623. 



Primnoa, 141. 



Pmtts, 423. 



Proboscidea, 551, 553 ; characters of, 600 ; 

 distribution of, in time, 646. 



Proboscis, of Medusa;, 111; of Crinoidea, 

 176 ; of Planarida, 191 ; of Acanthoce- 

 phala, 193 ; of Gephyrea, 204 ; of 

 Errantia, 213 ; of Lepidoptera, 271 ; of 

 Proboscidea, 601. 



Procellaridce, 504. 



Prochilus, 609. 



Proccelia (Crocodilia), 469, 470. 



Procyon, 609. 



Producta, 317. 



Productions, 317, 319. 



Proglottis, 185, 188. 



Pro-legs. 286. 



Promeropidce, 526. 



Pro-ostracum, 352. 



Propodite, 222. 



Propodium, 330. 



Proscolex, 186, 188. 



Prosimice, 631. 



Prosobranchiata, 335 ; divisions of, t'fc., 339. 



Prosoma, 344, 33. 



Prostomium, of Planarida, 191 ; of Anne- 

 lides, 206. 



Protaster, 182. 



Proteles, 582. 



Proteolepas, 233. 



Proteus, 435, 436. 



Proteus-animalcule, 54. 



Pro thorax, 263. 



Protoplasm, 5. 



Protopodite, 222. 



Protopteri, 42 1 (see Dipnoi). 



Protornis, 535. 



Protorosaurus, 467. 



Protovirgularia, 151. 



Protozoa, 14 ; general characters of, 48, e 

 seg. ; classification of, 49, e s<^. 



Proventriculus, of Earthworm, 209 ; of 

 Birds, 492. 



Proximal, 89. 



Psammobia t 323. 



