Index 



693 



Anterior, 51, 52 



chamber of eye, 215, 217 



lobe of pituitary, 72, 243, 244-247, 

 255 

 Anthozoa, 386, 395-397 

 Antibody, 160, 178, 181, 325 

 Anticoagulant, 180 

 Antigen, 182, 325 

 Antiprothrombin, 180 

 Antlers, 88, 111 

 Anura, 596, 598-601 

 Anus, of frog, 52, 61 



of insect, 519, 523 



of Paramecium, 369 



of vertebrate, 128, 135 

 Anvil (see incus), 220, 221, 222 

 Aorta, 64, 162, 165 

 Aortic arches, 164-166 

 Ape, 85, 256 

 Aphid, 539 

 Aphrodite, 454 

 Apis, 534-535 

 Apoda, 596, 601 

 Apodes, 590 

 Apopyle, 379 



Appendage, of Cambarus, 495, 496, 498, 

 499 



of vertebrate, 52, 108 

 Appendicitis, 178 



Appendicular skeleton, 58, 108-110 

 Appendicularia, 561 

 Appendix, vermiform, 129, 134 

 Apterygiformes, 625 

 Apterygota, 536, 538 

 Aquatic animals, 104, 153 

 Aqueduct, 70, 201 

 Aqueous humor, 217 

 Arachnida, 348, 489, 511-516 

 Arachnoid layer, 201 

 Arachnology, 21 



Araneae, 511-513 «• 



Arbacia. 544, 550, 553 

 Arbor vitae, 200 

 Arcella, 361 



Archaeopterygiformes, 623 

 Archaeopteryx, 615, 617, 623 

 Archaeornis, 615, 617, 623 

 Archaeornithes, 617, 623 

 Archenteron, 282, 645 

 Archeocyte, 376 

 Archeozoic era, 343 

 Archiannelida, 449, 450 

 Archibenthic zone, 664, 666 

 Architeuthis, 480, 481 

 Archosauria, 603, 612, 613 

 Arctic tern, 622 

 Areola, 495 

 Argonaut, 477, 481 

 Argonauta, 481 



Argulus, 506 

 Aristotle, 41, 278 

 Aristotle's lantern, 550 

 Arm, of octopus, 480 



of starfish, 212 



of vertebrate, 109 

 Armadillium, 507 

 Armadillo, 76, 85, 630, 632, 635 

 Army ant, 534 

 Arrow worm (see Sagitta), 348, 554- 



556 

 Arterial system, of frog. 64-66 



of mammal, 164-168 

 Arteriole, 166, 168 



afferent, 188 



efferent, 188 

 Arteriosclerosis, 239 

 Artery, 64, 161 



adrenal, 168 



aorta, 64, 162, 165 



carotid, 64, 65, 166, 167 



caudal, 167 



coeHac, 65, 168 



coeliaco-mesenteric, 65 



coronary, 166 



gastric, 65, 167 



genital, 168 



hepatic, 167 



histology, 169-170 



iliac, 66, 167 



iliolumbar, 168 



innominate, 166 



intercostal, 167 



mesenteric, 65, 168 



phrenic, 168 



pulmo-cutaneous, 64 



puhnonary, 65, 162, 164, 166 



renal, 168 



sciatic, 66 



splenic, 167 



subclavian, 65, 166, 167 

 Arthritis, 237 

 Arthrobranch, 50 

 Arthropoda, 486-517, 518-540, 646 



characteristics, 487-489 



classes of, 489-490 



classification, 45, 348 



digestive system, 127 



nervous system, 193 

 Artiodactyla, 630, 640 

 Ascaphus, 596, 601 

 Ascaris, 430-432 



chromosome number, 272 



fertilization, 276, 277 

 Aschelminthes, 438 

 Ascidiacea, 561 

 A scon, 377 

 Asellus, 507 



