658 



INDEX. 



^piornis, 613 



./Equoria, 240, 242 



yEschna, 479 



^Esthetes, 357 



^thalium, 199 



Aftershaft, 603 



Agalmia, 244 



Agamidae, 599 



Agassiz, 21 



Agelacrinoidea, 342 



Agelacrinus, 342 



Agkistrodon, 60 1 



Aglaophenia, 242 



Aglossa, 588 



Aglypha, 601 



Agnatha, 555 



Agrion, 479 



Air bladder, 567 



Air pipes, 609 



Air sacs of birds, 608 



Alae, 466 



Alae cordis, 470 



Alauda, 616 



Alaudidse, 616 



Albatross, 615 



Albertus Magnus, 9 



Alca, 615 



Alcedinidae, 616 



Alces, 642 



Alcidae, 615 



Alciopidae, 313 



Alcippe, 424 



Alcyonaria, 258 



Alcyonidae, 259 



Alcyonidium, 324 



Alcyonium, 255, 259 



Aletia, 495 



Alima, 429 



Alimentary tract of vertebrates, 546 



Alisphenoid bone, 522 



Allantoidea, 553 



Allantois, 553 



Alligator, 602 



Alligator turtle, 596 



Allobophiora, 316 



Alloposus, 395 



Allotheria, 632 



Alosophila, 494 



Alpaca, 643 



Alpheus, 434 



Alternation of generations, 144, 5 12 



Altrices, 612 



Alula, 604 



Alveolar duct, 548 



Alveoli, 625 



Alveolus, 548 



Alytes, 585 



Amaroucium, 510 



Ambergris, 646 



Amblyopsidse, 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 



Amiidse, 574 



Ammocoetes, 557 



Ammonitidae, 394 



Amnion, 472, 553 



Amniota, 553, 588 



Amoeba, 61. 62, 187, 189 



Amoebina, 189 



Amoeboid motion, 187 



Amphacanthe, 574 



Amphiaster, 70 



Amphibia, 580 



Amphibiotica, 479 



Amphiccele, 518 



Amphicoelias, 596 



Amphidiscs, 227 



Amphigony, 142 



Amphilina, 286 



Amphineura, 356 



Amphioxus, 502, 504 



Amphioxus. cleavage of, 151 



Amphioxus, gastrula of, 156 



Amphiphorus, 291 



Amphipoda, 438 



Amphisbaena, 599 



