INDEX — GLOSSARY 



421 



Degeneration, in barnacles, 305 ; in 



Urochorda, 322. 

 Del Rio formation, fossils from, 227 ; 



geologic age of, 227. 

 Delta, of Ganges and Indus rivers, 5 ; 



of Greenbrier formation, 5 ; of Mauch 



Chunk formation, 5. 

 Delthyrium, 181, 188. 

 Deltidial plates, 183, 189. 

 Deltidium, 189, iq6. 

 Dendrerpeton, 352. 

 Dendrite, 21, 22. 

 Dendroidea, 116, 117. 

 Dendropupa vetiista, 352. 

 Dentalium, 251 ; D. attenuatum, 251. 

 Dentary bone, of birds, 372 ; of rep- 

 tiles, 367. 

 Dentine, of elephant's molar, 387; of 



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



381. 

 Dermal, pertaining to the skin of 



animals. 

 Dermal branchiae, 152. 

 Dermal fin rays, 346. 

 Dermaptera, 318. 

 Dermis, the deep layer of the skin 



beneath the epidermis, or scarfskin ; 



of the crayfish, 278; of vertebrates, 



324- 

 Descent, see evolution. 

 Desmospongiae, 98. 

 Development; see also reproduction; 



of pelecypods, 216-218; of Unio, 228. 

 Devil-fish, in evolution, 83. 

 Devil's apron, 36, 43. 

 Devonian, 407. 

 Devonian fossils figured, 12, 68, 104, 



131, 132, 136, 146, 164, IQ3, iq8, 203, 



204, 263, 264, 2g8, 344, 346. 

 Dextral, 241. 



Dextral shell in gastropods, 241. 

 Diaphragm, 330, 331. 

 Diatomaceous ooze, 34. 

 Diatomeae, 34 ; see also diatoms. 

 Diatoms, 34,54; deposits of, 12; 



food of brachiopods, 184; food of 



crinoids, 161 ; food of Globigerina, 90; 



food of pelecypods, 212; geologic 



range of, 408 ; silica in, 26. 

 Dibranchiata, 268-273 ; absence of 



ocular tentacles in, 258; geologic 



range of, 269 ; in evolution, 83 ; ink 



sac of, 268 ; skeleton, etc., see Om- 

 mastrephes. 



Dicotyledones, 79-81 ; see also dicoty- 

 ledons. 



Dicotyledons, 79-81 ; early flora of, 77 ; 

 fossil, 80-81, 81; geologic range of, 

 408; more primitive than mono- 

 cotyledons, 80. 



Dictyonema, 117; D. flabelliforme, 117, 

 118. 



Dictyopteris, 47. 



Dictyospongidae, 105. 



Diductor muscles, 182, 183, 185. 



Digestion, see also under the various 

 classes ; of A moeba, 85 ; of Hydrozoa, 

 no; of Protozoa, 85. 



Digestive canal, in cat, 330, 331 ; in 

 Invertebrata, 331 ; in Vertebrata, 330, 

 _33i- 



Digits, toes; of birds, 370, 372; of 

 cat, 327; of horses, 393, 395; of 

 mammals, 385. 



Digits, number of, in birds, 328; in 

 camel, 328; in mammals, 328; in pig, 

 328; in reptiles, 328; in rhinoceros, 

 328; primitive, 328. 



Dileptus, 84. 



Diminution in number of mammals, 

 causes of, 374-376. 



Dinoceras, 386. 



Dinoflagellata, 84. 



Dinophilea, 141. 



Dinornis maximus, 371. 



Dinosaur, neck-frilled, 364. 



Dinosauria, 359-364, 359, 360, 361, 362, 

 364; food supply, etc., see dinosaurs. 



Dinosaurs, 359-364, 339, 360, 361, 362, 

 364; bones of, 11; derivation of, 

 359; evolution of, 373; food of, 359; 

 problem of food supply of, 361 ; 

 skin ornamentation preserved, 19, 

 359; subdivision of, 359, 360, 363; 

 the largest land animals, 361. 



Diploglossata, 318. 



Diplograpius, 113, 116; D. foliaceus, 

 113-115, 114, 119. 



Diplomystus, 347. 



Dipneusti, 343-344; autostylic, 339; 

 examples of, 344, 344; fins in, 340; 

 geologic range of, 344; lung of, com- 

 pared to air-bladder of Teleostomi, 

 343; respiration of, 343. 



