440 



INDEX — GLOSSARY 



Polystichum, 46. 



Polytrichum commune, 42, 43, 44. 



Pondweed, 77, 78. 



Poplar, 77, 81 ; fossil record of, 81. 



Popidus, the poplar, 81. 



Pore-rhombs, 148; oi Caryocrinus, 156. 



Pores, in corals, 137 ; in sponges, 100. 



Porifera, 96-107; see sponges. 



Porospora gigantea, 84. 



Porpoises, 399. 



Port Jackson shark, 342. 



Portuguese man-of-war, 121. 



Posterior adductor muscle, 20Q ; re- 

 tractor muscle, 20Q, 211, 214. 



Post-frontal bone, in fishes, 346. 



Post-temporal bone, in fishes, 346. 



Potomac formation, fossils from, 61 ; 

 geologic age of, 61. 



Pre-Cambrian, 407. 



Precious red coral, 128. 



Premaxilla bone, in fishes, 346. 



Premaxillary bone, in reptiles, 367. 



Premolar teeth, of the cat, 331. 



Preparation of dried specimens, 21Q. 



Preservation, of fossils, 3-8 ; of plants, 3 1 . 



Presplenial bone, in reptiles, 367. 



Primates, 399-400 ; evolution of, 399. 



Primicorallina trentonensis, 36, 37. 



Primitive characters, persistence of with 

 modern ones, example of, the ele- 

 phant, 386. 



Prioniodus, 146, 146. 



Prismatic shell structure, 215. 



Prismodictya, 97, 103-105; P. pris- 

 matica, 104. 



Proangiosperms, age of, 66. 



Proboscidea, 386-389 ; geologic range 

 of, 386 ; hoofs of, 386, 386 ; incisor 

 teeth of, 386, 388; molar teeth of, 386, 

 387, 388. 



Proboscis, in Nereis, 143, 144. 



Prodissoconch, 218, 231, 231. 



Prodryas persephone, 31 g. 



Productus, 188, 198; P. giganteus, 191; 

 P. semireticiilatus, 23, 192, 198, iqq. 



Proloculum, 89. 



Pronghorn antelope, 398. 



Proostracum compared to squid skele- 

 ton, 272; function of, 272; oi Belem- 

 nites, 271, 272; of Sepia, 272, 



Protaspis, 286, 292-293. 



Protegulum, 187, 185. 



Proteid, 2. 



Proteids, in vertebrate digestion, 332. 

 Protephemeroidea, 319. 

 Prothallus, 43, 45. 

 Protoblattoidea, 318. 

 Protocaris, 303. 



Protoconch, of Belemnites, 271 ; of gas- 

 tropods, 238, 23Q, 240 ; of nautiloids 



and ammonoids compared, 261. 

 Protodonata, 319, 330. 

 Protodonta, 378. 

 Protcecium, in Bugula, 176; in Fenes- 



tella, 180. 

 Protohemiptera, 319. 

 Protohippus, 303, 394. 

 Proto-nauplius, 292. 

 Protonema, 42. 



Protoplasm, i ; in Protozoa, 83, 84. 

 Protopodite, 276; of the crayfish, 276; 



of the lobster, 279 ; of the trilobite, 



286, 288. 

 Protopteriis, 344. 

 Protorohippiis, 393, 393. 

 Protorthoptera, 318. 

 Prototheria, 377, 378. 

 Protozoa, 83-95, 212; classification of, 



84 ; compared with sponges, 100 ; 



digestion, etc., see Amceha ; geologic 



range of, 409 ; secretion of hard parts 



in, 84 ; size of, 84. 

 Protozoons, the Protozoa, 212. 

 Protractor muscle in pelecypods, 214. 

 Protremata, 189. 

 Proximal, near the point of attachment ; 



opposed to distal. 

 Pseudo-columella, 123, 126. 

 Pseudo-fossils, 21. 

 Pseudomorphs, 13. 

 Pseudopodia, in Amoeba, 85; in Fo- 



raminifera, 88 ; in Glohigerina, 90 ; 



in Protozoa, 85 ; in Rhizopoda, 88. 

 Pseudoscorpionida, 316. 

 Pteranodon, 365. 

 Pteria, 224-225, 231. 

 Pteridophyta, 43, 44^55 ; classification 



of, 46 ; geologic range of, 408. 

 Pteridophytes, the Pteridophyta. 

 Pteris, 30. 

 Pterodactyls, the pterosaurs, 357; 



food of plesiosaurs, 357. 

 Pterodactylus, 365. 

 Pteropoda, 248, 248 ; see also pteropods. 



