422 



INDEX — GLOSSARY 



Dipnoi; see Dipneusti. (The name 

 Dipnoi cannot be used for the lung- 

 fishes as it was used earlier for a group 

 of the Amphibia.) 



Diprotodonts, 378. 



Diptera, 319. 



Dipterus, 344. 



Discinids, 192. 



Disk, of starfish, 149. 



Dismal Swamp, sphagnum in, 44. 



Dissepiments, in corals, oblique cal- 

 careous partitions stretching from 

 septum to septum, 129. 



Dissoconch, 231, 231. 



Distal, remote from point of attach- 

 ment. 



Distomum hepaticum, 140. 



Distortion of fossils, 21. 



Ditypic, containing two representa- 

 tives. 



Divergence, of ruminants, 398. 



Dog-fish, 343. 



Dogs, 379, 381 ; giant, in North America, 

 376. 



Dog-tribe, 381. 



Doliolum, 322. 



Dolphins, 399. 



Dorsal fin, 338; in pelecypods, 2/0, 216. 



Dorsal muscle, in crayfish, 278; in 

 crustaceans, 278; in trilobites, 288. 



Dorsal shield of trilobites, 287, 291. 



Dorsal vertebrae of the cat, 325, 326 



Doublure, 286, 287. 



Dragon flies, eye of, 317; modern, 319; 

 primitive, 319, 350. 



Dried specimens, preparation of, 219. 



Dromatherium, 378. 



Dromocyon velox, 380. 



Dryopithecus, 400. 



Duck-bill, 378. 



Dugong, 398. 



Duodenum, 330. 



Earshell, see Haliotis. 



Ecaudata, 349. 



Echidna, 378 ; development of young, 377. 



Echinarachnius, 166. 



Echinodermata, 148-172; see Asterias 

 and echinoderms. 



Echinoderms, 148-173 ; ambulacra com- 

 pared, 148; ancestry of, 149; classes 

 of, compared, 148; compared with 



coelenterates, 148; digestion, etc., see 

 Asterias; geologic range of, 409. 



Echinoidea, 165-171 ; 5ee echinoids and 

 Strongylocentrotus . 



Echinoids, 1 65-1 71 ; geologic range of, 

 166,409; habitat of, 166; respiration, 

 etc., see Strongylocentrotus ; skeleton 

 (test) of, 165. 



Ectoderm, in Coelenterata, 108 ; in 

 corals, 126; in crustaceans, 281; in 

 sponges, 99. 



Ectoprocta, 177-180. 



Edentata, 382 ; evolution of, 382 ; geo- 

 logic range of, 382. 



Edible crab, 307. 



Edrioasteroidea, 149, 157. 



Eel-grass, 75, 217. 



Eels, 248. 



Egg, of bryophytes, 42 ; of crustaceans, 

 283; of Hydrozoa, in; of plants, 

 30; of pteridophytes, 45. 



Egg of birds, shell of, 370; white of, 

 370; yolk of, 370. 



Egg capsule of gastropods, 239, 23Q. 



Elasmobranchii, 341-343 ; advance 

 over Cyclostomata, 341 ; born alive, 

 339 ; eggs of, 341 ; geologic range of, 

 341 ; habitat of, 341 ; hyostylic, 339; 

 respiration of, 341. 



Elasmobranchs, the Elasmobranchii. 



Elephants, see also Proboscidea ; African, 

 389; Columbian, 383; evolution of, 

 387, 388; extinction of, 376; food per 

 day, 361 ; Imperial, 389 ; Indian, 

 molar tooth of, 387; Indian, vertical 

 section through fore foot of, 386; 

 in North America, 375 ; map showing 

 distribution in North America, 3Q0; 

 migration of, 23 ; primitive charac- 

 ters of, 386; specialized characters 

 of, 386. 



Elephant tribe, 386. 



Elephas, 387, 3S8, 389; E. columbi, 383; 

 E. imperator, 389; E. primigenius, 



387. 



Elm, American, 43. 



Elytra, 319, 319. 



Embioidea, 319. 



Embrithopoda, 389. 



Embryo, in angiosperms, 77 ; in brach- 

 iopods, 186; in fossil seeds, 62; in 

 seed-plants, 56; in sponges, loi. 



