658 



INDEX. 



ylipiornis, 613 



yli(|Uoria, 240, 242 



/Eschiia, 479 



ylisthetes, 357 



yEtlialiuni. 199 



Aftershaft, 603 



Agalmia, 244 



Agamidse, 599 



Agassiz, 21 



Agelacrinoidea, 342 



Agelacrinus, 342 



Agkistrodon, 601 



Aglaophenia, 242 



Aglossa, 588 



Aglypha, 601 



Agnatha, 555 



Agrion, 479 



Air bladder, 567 



Air pipes, 609 



Air sacs of birds, 608 



Ala;, 466 



Alte cordis, 470 



Alauda, 616 



Alaudidce, 616 



Albatross, 615 



Albertus Magnus, 9 



Alca, 615 



Alcedinida?, 616 



Alces, 642 



AlcidK, 615 



Alciopidre, 313 



Alcippe, 424 



Alcyonaria, 258 



Alcyonid^, 259 



Alcyonidium, 324 



Alcyonium, 255, 259 



Alctia, 495 



Alima, 429 



Alimentary tract of vertebrates, 546 



Alisphenoid bone, 522 



AUatitoidea, 553 



Allantois, 553 



Alligator, 602 



Alligator turtle, 596 



Allobophora, 316 



Aiioposus, 39^ 



Allotheria, 632 



Alosopliila, 494 



Alpaca, 643 



Alpheus, 434 



Alternation of generations, 144, 512 



Altrices, 612 



Alula, 604 



Alveolar duct, 548 



Alveoli, 625 



Alveolus, 548 



Alytes, 585 



Amarouciuin, 510 



Ambergris, 646 



Amblyopsidue, 576 



Amblypoda, 643 



Amblystoma, 587 



Amblystoma, larva of, 36 



Ambulacra, 331 



Ambulacral grooves, 335 



Ambulacral plates, 335 



Ambulacral system, 122, 330 



Ambulacral vessels, 331 



Ametabolous, 473 



Amia, 574 



Amia, tail of, 41 



Amicula, 357 



Amiidoe, 574 



Ammocoetes, 557 



Ammonitida;, 394 



Amnion, 472, 553 



Amniota, 553, 5S8 



Amceba, 61. 62, 1S7, 189 



Amcebina, 189 



Amoeboid motion, 187 



Amphacanthe, 574 



Amphiaster, 70 



Amphibia, 580 



Amphibiotica, 479 



Amphicrele, 518 



Amphicrelias, 596 



Amphidiscs, 227 



Amphigony, 142 



Amphilina, 286 



Ampliineura, 356 



Amphi<^xus, 502. 304 



Amphioxus. cleavage of, 15 1 



Amphioxus, gastrula of, 156 



Amphiphorus, 291 



Amphipoda, 438 



Amphislnvii.^, 9)0 



