INDEX 



Aard vark, 382. 

 Abdominal pores, I07_, 

 Abdominal vein, 197. 

 Abducens nerve, 61. 

 Abomasum, 35. 

 Acanthias, 239. 

 Acanthodes, 251. 

 Acanthoderma, 266. 

 Acanthodidce, 251. 

 Acanthoglossus, 377. 

 Acanthopteri, 258. 

 Acanthopterygii, 258. 

 Accessory of Willis, 64. 

 Accipiter, 348. 

 Accipitres, 348. 

 Aceratherium, 395. 

 Acetabular bone, 171. 

 Acetabulum, 170. 

 Achsenodon, 397. 

 Achirus, 265. 

 Acinose glands, 90. 

 Acipenser, 251. 

 Acipenseridse, 250. 

 Acris, 287. 

 Acrodont teeth, 294. 

 Actinistia, 249. 

 Actinosts, 175. 

 Actinotrichia, 174. 

 Adapis, 415. 

 Adapisoricidse, 385. 

 Adder, 325. 

 Adipose tissue, 14. 

 Adrenal, 131. 

 yEgitognathee, 351. 

 ^githognathous, 335. 

 ^piornis, 346. 

 ^piornithes, 346. 

 yEtosaurus, 328. 

 Afferent nerves, 47. 

 Agamidse, 320. 

 Agathaumas, 317. 

 Agkistrodon, 326. 

 Aglossa, 286. 

 Aglyphodonta, 325. 



Agnatha, 219. 

 Agonidas, 260. 

 Agriochoerus, 398. 

 Aguti, 391. 

 Air bladder, 25. 

 Air sacs, 31. 

 Aistopoda, 283. 

 Ala spuria, 330. 

 Albatross, 349. 

 Albulia, 256. 

 Albumen, 207. 

 Alca, 349. 

 Alcedo, 348. 

 Alces, 399. 

 Alecithal eggs, 206. 

 Alectoromorphas, 350. 

 Alepocephalidx, 256. 

 Alewife, 256. 

 Alisphenoid, 158. 

 Allantoic artery, 190. 

 Allantoic placenta, 374. 

 AUantoidea, 288. 

 Allantois, 373, 

 Alligator, 328. 

 Alligator gar, 252, 

 Alligatoridse, 328. 

 Alligator snapper, 311. 

 AUotheria, 377. 

 Alopiidas, 239. 

 Alpaca, 398. 

 Altrices, 330. 

 Alula, 330. 

 Alutera, 266. 

 Alveoli, 20. 

 Alveoli of lung, 30. 

 Alytes, 287. 

 Amber fish, 263. 

 Amblypoda, 400. 

 Amblyopsidx, 257. 

 Amblyopsis, 257. 

 Amblyrhiza, 391. 

 Amblystoma, 285. 

 Amia, 252. 

 Amiidae, 252. 



419 



Amiurus, 255. 

 Ammocoetes, 222. 

 Ammodytes, 263. 

 Ammodytidae, 262. 

 Ammodytoidea, 262. 

 Amnion, 288. 

 Amniota, 288. 

 Amphibia, 274. 

 Amphiccelias, 315. 

 Amphiccelous, 138. 

 Amphicyon, 412. 

 Amphilestes, 380. 

 Amphioxus, 2. 

 Amphiplaga, 259. 

 Amphiplatyan, 140. 

 Amphisbsena, 321. 

 Amphistylic skull, 234. 

 Amphitherium, 380. 

 Amphiuma, 285. 

 Amphiumidte, 285. 

 Ampullae, 68, 70. 

 Amyda, 310. 

 Amyzon, 255. 

 Anabas, 262. 

 Anableps, 257. 

 Anacanthini, 264. 

 Anaconda, 325. 

 Anal fin, 177, 228. 

 Anallantoidea, 226. 

 Anamnia, 226. 

 Anapophysis, 141. 

 Anaptomorphidse, 415. 

 Anaptomorphus, 415. 

 Anarrhichas, 261. 

 Anarrhichidas, 261. 

 Anas, 348. 

 Andrias, 285. 

 Angler, 266. 

 Anguilla, 257. 

 AnguillidEe, 256. 

 Anguis, 320. 

 Angulare, 164. 

 Anhima, 348. 

 Anhinga, 347. 



