INDEX. 



A.ABDTARS, 541. 



Aardwolf, 682. 



Ahdominalia {Cirripedia), 214 ; (Fishes), 



3S5. 

 Abranehiata (yeiiebvat&X 859. 

 Abyla, 95. 

 Acalephce, 100. 

 Acantkocephala, 165, 172 ; characters of, 



175, 170. 

 Aea/nthometra, 61. 

 Acanthometriita, 61, 

 AcanthophiSy 432. 

 Accmthopteri, 387. 

 Acanthopterygii, 376, 382. 

 Acanthospongiat 6S. 

 AcaHda, 240. 

 Acarina, 238 ; characters and families of, 



239. 

 .<4ccipi(rin£B, 503. 

 Acephala (Mollusea), 30O. 

 Acerotlienutn, 613. 

 Acervulina, 56. 

 Acetabula, 322. 

 Achetina, 260. 

 Achtheres, 209. 

 ylctcu^a. 319. 

 .^icicuZiefcE, 319. 

 .dciTtfito, 70, 75. 

 AcipeTiser^ 403. 

 ^cm^a, 318. 



Acorn-shells, 210, 211, 21S. 

 Aerodus, 397. 

 Acrotretay 297. 

 Acrydium, 260, 

 ^c^eonia, 319. 

 -4cWma, 115, 117, 118. 

 jlcfmidce, 117, 118; development of, 113., 

 Actinonieres, 130. 

 Aetinophrys, 62, 54, 61. 

 Actinosoina, 116. 

 Actiiwzoa^ 80; characters of, 114, 115; 



divisions of, 116; distribution of, 134. ' 

 Aculeus, 268. 

 Adelarthrosomata, 238; characters and 



families of, 241. 

 JEginidce, 103, 110. 

 MgiWipsiSs 103. 

 uEolidce, 319. 

 jEoliS, 319; - 

 jEpiomiSf 508. 

 Againidce, 440. 

 AgapomiSj 494. 

 Agathistega, 57. 

 Agdacri7iite8, 158. 



Agonti, 588. 



.4i;«r«s, 579. 



Air-bladder of Fishes, 874. 



Air-receptacles of Biids, 466, 467. 



Alcedo, 501. 



-4?ca, 476. 



Alces, 564. 



.aicwfce,.476. 



Alcyojiaria, 116; characters and divisions 

 of, 125-128; distribution of, in time, 139. 



AlcyonidcB, 125, 126. 



Aleyonium, 126. 



AUantoideat 359. 



Allantois, 359, 360. 



Alligator, 442, 444. 



Alpaca, 562. 



Alveolus (Belemnite), 330, 



Amber, insects preserved in, 273. 



Amblyrhynchus, 442. 



Atrhblystoma^ 411. 



Ambulacral system {Echinodermata^ , 142, 

 143 ; of Echinus, 147 ; of Star-fishes, 

 151 ; of Ophiuroidea, 154 ; of Crinoidea, 

 155 ; ot Uolothuroi4ea, 160, 161. 



Ameiva, 439. 



Ametabolic Insects, 254, 257. 



Amia, 391. 



Ammodytes, 386. 



Airvmonites, 333, 334, 335, 337. 



Ammonitidcef 833, 334, 835 ; characters 

 of, 333 ; distribution of, in time, 337. 



Amnion, 359. 



Amaiiota, 359. 



AmoBbaf 7, 48; structure of, 50; pseudo- 

 podia of, 51 ; reproduction of, 51. 



Amcebea, 49, 51, 52. 



Amasbina, 52. 



Amphibia, 359, 360, 399, 400; general 

 characters of, 406-40S; development of, 

 40(i, 4U7 ; respiratory organs of, 407 ; 

 orders pf, 4US-417 ; distribution of, in 

 time, 418. 



Amphicoslia (Crocodilia), 443, 445. 



A'mphidiscs, 66. 



Amphilestes, 008. 



Ampkioxus, 348, 356, 373, 376. 



Amphipnetista, 410. 



Amphipoda, 20S, 223; characters of, 224; 

 heart pf, 225. 



AmphishoBna, 435, 437. 



Amphispongia, 6S. 



Amphitherium, 608, 609. 



Amphmma, 410, 411. 



Atnpuliaria, 310, 31S. 



