INDEX. 



Aardvark, 677. 



Aardwolf, 747. 



Abdominalia (Cirripedia), 292 ; (Fishes), 

 485. 



Abiogenesis (see Spontaneous Generation). 



Abranchiata (Annelida), 259. 



Abranchiata (Vertebrata), 458. 



Abyla, 133. 



Acalephce, 127. 



Acanthocephala, 229 ; characters of, 242. 



Acanthocystis, 83, 



Acanthodidce, 492. 



Acanthornetra, 79. 



Acanthometrina, 79. 



Acantfiophis, 542. 



Acanthopteri, 487. 



Acanthopterygii, 477, 483. 



Acarida, 321. 



J.caria, 320. 



Accessory plume, 573. 



Acephala (Mollusca), 396. 



Acerotherium, 695, 690, 721. 



Acetabula, 419. 



Achetidce, 350. 



Achtheres, 284, 285. 



Aciculidce, 415. 



Jcineta, 99. 



Acipenser, 489, 490, 505. 



Acontia, 156. 



Acorn-shells, 287, 288, 289. 



Acridiidce, 350. 



Acrodm, 498. 



Actinia, 106, 155, 156, 180. 



Actinidce, 154. 



Actinomeres, 177. 



Actinometra, 214, 216. 



Actinophrys, 77, 81, 82. 



Actinosoma, 154. 



Actinosphcerium, 82. 



Actinozoa, 108 ; characters of, 151 ; divi- 

 sions of, 154 ; distribution of, 180. 



Aculeate Hymenoptera, 358. 



Aculeus, 357. 



Adelarthrosomata, 322. 



Adjutant, 611. 



jEgineta, 130. 



jflginidas, 130, 143. 



^Eginopsis, 130. 



jfZgithognathce, 578. 



jEluridce, 741. 



jEluropus, 741. 



jElurus, 741, 742. 



jEolidce, 413. 



409. 



^fipiornis, 600. 



JSquoridai (fossil), 150. 



^Eshna, 334. 



Aetomorphce, 630. 



Agama, 550. 



Agamidce, 550. 



Agapornis, 621. 



Agnopterus, 607. 



Agouti, 755. 



Ai, 674. 



Air-bladder of Fishes, 475. 



Air-receptacles of Birds, 586 



Albatross, 604. 



^4Zca, 603. 



^Zcedo, 629. 



4 Zees, 716. 



Alcidce, 602. 



Alcippe, 291. 



Alcyonaria, 154; characters and divisions 

 of, 165 ; distribution of, in time, 180. 



Alcyonidce, 166, 180. 



Alcyonidium, 379. 



Alcyonium, 166. 



Allantoidea, 458. 



Allantois, 445, 458. 



Alligator, 555, 557, 553. 



Alpaca, 712. 



Alveolus (Belemnite), 430. 



Amber, insects preserved in, 344. 



Amblyrhynchus, 555. 



Amblystoma, 517, 518. 



Ambulacral system (Echinodermata) 191 ; 

 of Echinoidea, 196, 197; of Star-Fishes, 

 202; of Ophiuroidea, 206; of Crinoi- 

 dea, 208 ; of Holothuroidect, 219. 



Ameioa, 550. 



American Cuckoos, 620. 



American Vultures. 632. 



Ametabolic Insects, 342, 344, 345. 



.4mia, 489, 490, 493. 



Amiadce, 492. 



Ammoccetes, 482. 



Ammodytes, 486. 



Ammonites, 433, 434, 435, 436, 437. 



Ammonitidce, 433, 434, 436. 



Amnion, 445, 458. 



J.ramoa, 458. 



^mceSa, 19, 20, 61 ; structure of, 63 ; pseu- 

 dopodia of, 64 ; reproduction of, ib. 



Amwbea, 61, 62, 65. 



Amoebina, 65. 



Amphibia, 457, 458, 459 ; general charac- 



