5oo REPTILES, AMPHIBIANS AND FISHES 



Dinosaurs, ankle, 12. 



— bipedal gait, 96. 



■ — dermal armour, 117. 



— food, 47, 51. 



— orders of, 23. 



— period, 29. 



— skeleton, 128, 129. 

 Diodon hystrix, habitat, 273. 

 Diodontidae, 272. 

 Diplodocus, food, 51. 



— size and attitude, 6. 



— swallowing pebbles, 156. 



— vertebrae, 128. 

 Dipnoi, aestivation, 299. 



— antiquity, 254. 



— blood-vessels of air-bladder, 386. 



— larvae, 342. 



— tail, 256. 



— teeth, 255. 



Dipsadomorphus, fangs, 144. 

 Dipterus, 254, fig., 255. 

 Discoglossidae, 166. 

 Distira semperi, 107. 

 Discopyge, electric organs, 432. 

 Diseases of fish, 358. 



Ditmar, R. L., on horned toad, 147. 

 Dolichorhynchus, 463. 

 Dolichosauria, 106. 

 Dolichosaurus, period, 27. 

 Dolopichthys, 289. 

 Dolphin fishes, 284. 

 Dominant Orders, 3r. 

 Doras, nest, 324. 



— voice, 407. 

 Draco, flight, 97. 



Dragonet, sexual characters, 310. 

 Drum, voice, 406. 

 Dryophis, colour, 86. 

 Dryptosaurns, ankle, 12. 

 Duration of life in reptiles, 56. 



Ear, in reptiles, 117. 



Echeneis, habits, 305. 



Echis arenicola, 44. 



Edible frog, 165. 



Eel, age and growth, 356, 357. 



— eggs, 351. 



— life-history, 348. 



— larvae, figs., PI. XXIX. 

 — ■ metamorphosis, 355. 



— migrations, 298. 



Efferent arteries of dog-fish, 242. 

 Eggs of Amphibia, 184, 208. 



— of Ascidians, 485. 



— of fishes, 245, 318. 



— of reptiles, 13, 70, 71. 



— of Teleostei, 342. 



— of Urodeles, 201. 



Ehrenbaum, Dr., on habits of lump- 

 sucker, 325. 



— on butter-fish, 326. 



Eigenmann, C. H., on eye in Amphis- 

 baenidae, 14. 



— on gestation of Sebastodes, 337. 



— on variation of Leuciscus balteatus, 



362. 

 Elapinae, distribution, 43. 

 Elasmobranchs, absence of air-bladder, 

 .385. . 



— intromittent organs, 308. 

 — ■ reproduction, 314. 

 Electric cat-fish, 433. 



— eel, 432. 



— organs, 431. 



action and evolution, 436. 



structure, 433. 



Elginia, horns, 127. 

 Elopidae, evolution, 258. 

 Embiotocidae, gestation, 335, 336. 



— habitat, 276. 



— viviparity, 331, 332. 

 Emery, Prof., on Fierasfer, 304. 

 Empedias, 16. 



Emys orbicularis, 45. 

 Endostyle, of Amphioxus, 464. 



— of Ascidians, 475. 



— of Tunicates, 484. 

 Endothiodon, dentition, 143. 

 Engraulis, fossil, 382. 

 Engyra glutinans, 481. 

 Enteropneusta, 489. 



— distribution, 492. 



— habits, 490, 491. 

 Eochelone, size, 7. 

 Epidermis of fishes, 422. 

 Epidermic scales of reptiles, 13. 

 Epigonichthys, 463. 

 Ercmias, eyelid, 116. 

 Eryops, 15. 



Erythinus, respiration by air-bladder, 



387- 

 Eryx jaculus, 44. 

 Essence d'Orient, 423. 

 Eugnathidae, 258. 



Eumeces quinquelineatus, colour, 79. 

 Europe, fresh-water fishes, 265. 



— marine fishes, 275. 

 Eurycormus, 258. 

 Evolution of fishes, 438. 



— of reptiles, 15. 

 Exoccetus habitat, 284. 

 External gills, evolution, 175. 



— of Amphibia, 226, 227. 



Eye, degeneration in reptiles, 116. 

 Eyed lizard, protective coloration, 79, 



88. 

 Eyes of Anableps, 397. 



— of fishes, 243. 



Fascination by snakes, 53. 



Fear of snakes, 53. 



Fer de lance, colour, 82. 



