INDEX — GLOSSARY 



423 



Embryo-sheath, 113. 

 Embryonic graptolites, 116. 

 Embr>-onic Hfe, freedom of movement in, 



Emulsify, to reduce fats to a milky fluid. 

 Enamel, of elephant's molar, 387 ; of 



horse's molar, 396 ; of rodent's incisor, 



381; of teeth of Edentata, 382. 

 Endoderm, in Coelenterata, 108; in 



corals, 126; in crustaceans, 281; 



in sponges, 99. 

 Endopodite, 276; of the crayfish, 276; 



of the lobster, ^yg ; of trilobites, 2S6, 



288. 

 Endoprocta, 177, 181. 

 Energy, derivation of, in body, 332. 

 Engelhardtia, 80; E. mississippiensis, 



81 ; distribution, present and past, 81. 

 Enrollment, in trilobites, 288, 291. 

 Entomolithus paradoxus, 294. 

 Entomostraca, 306. 

 Eoanthropus dawsoni, 400. 

 Eobasileus, 386. 

 Eocene, 407. 



Eocene fossils figured, 76, 81, g2, 177, 246, 

 375, 380, 384, 385, 388, 392, 393, 394, 



3Q5- 

 Eohippus, 392, 393 ; characteristics of, 



392, 3Q3, 394, 395- 



Eotomaria supracingulata, 244. 



Ephedra, 75, 408. 



Epidermis, the superficial non-sensi- 

 tive layer of the skin, the scarfskin ; 

 of crustaceans, 281 ; of pelecypods, 

 228; oi Unio, 228; of vertebrates, 324. 



Epiglottis, 330. 



Epihippus, 393. 



Epineural plates, 366. 



Epistome, in Bryozoa, 180. 



Epitheca, 126, 128. 



Epithelial, pertaining to the epithelium. 



Epithelium (plu. epithelia), the super- 

 ficial layer of cells lining such surfaces 

 as the digestive canal. 



Equilibrium, maintenance of, in crusta- 

 ceans, 283 ; in mammals, 335. 



Equisetales, 48-50 ; see equisetes. 



Equisetes, 48-50; fossil, 48-50; geo- 

 logic range of, 408 ; in evolution, 55. 



Equisetites, 48. 



Equisetum, 48, 49. 



Equus, 393, 393, 394, 395; E. caballus, 



373 ; skull and brains of, 373 ; E. 

 scotti, 383; evolution of, 392-396; 

 recapitulation in, 394. 



Era, 407. 



Eryon, 307. 



Eryops, 350. 



Esophagus (spelled also oesophagus), 

 of cat, 330, 331; of corals, 123; of 

 mammals, 330, 331. 



Estheria, 301, 302; E. belfragei, 302; 

 E. ovata, 302, 302 ; compared with 

 Fordilla, 222; habitat of, 302. 



Eiicalyptocrinus, 159, 162-163; E. 

 crassus, 163. 



Euglena, chlorophyl in, 3 ; food getting 

 in, 29. 



Euphausiacea, 306, 307. 



Euplectella, 96, 105 ; E. aspergillum, 

 103, 104; E. crassistellata, 103. 



Eurypterida, 309, 312-314; compared 

 to Scorpio, 310; environment of, 313 ; 

 evolution of, 310; growth stages of, 

 313; habitat of, 313; larval stages 

 of. i'^i', probable change in habitat 

 of, 313; recapitulation in, 313; 

 relationship to Limulus and scorpions, 

 310; relationship to trilobites, 311. 



Eurypterids, the Eurypterida. 



Eurypterus, 314; E. remipes, 313. 



Euspongia, 96, 106. 



Eusthenopteron, 345 ; E. foordi, 346. 



Eutheria, 377 ; production of young, 377. 



Euthyneura, 244. 



Even-toed ungulates, 396-398. 



Evolution, Bactrites in, 261 ; gastrula 

 in, 112 ; in birds, 371 ; in brachiopods, 

 200; in caudal (tail) fins, 341; in 

 eurypterids, 310; in Fissipedia, 381; 

 in gastropods, 240, 247 ; in ichthyo- 

 saurs, 358-359 ; in incisor teeth of 

 mammals, 332; in Limulus, 310; 

 in Merychippus, 394 ; in mollusks, 

 231 ; in plants, 31, 43 ; in plesiosaurs, 

 '356; in scorpions, 310; in Squamata, 

 367; in trilobites, 311; in Vermicu- 

 laria, 247 ; Insectivora in, 399 ; Mwri- 

 therium in, 398 ; of animals, 83 ; of 

 birds, 372, 373; of book-gills, 310; 

 of book-limgs, 310; of camels, 397; 

 of Chordata, 83 ; of crayfish, 307 ; 

 of crustaceans, 274 ; of cycadeoids, 

 63; of dinosaurs, 373; of echino- 



