INDEX 



• A 



Abducens, 92 

 Abducent nerve, 137 

 Abnormalities, 226 



of brain, 234 

 Absorption of food materials 69, 173 

 Abyssal zone, 474 

 Acanthocephala, 337, 430 

 Acetabulum, 87, 115 

 Acnidosporidia, 275 

 Acoela, 323 

 Acromegaly, 202 

 Actinaria, 309 

 Actinophrys, 271 

 Adaptation, 465 

 Adrenal glands, 199 

 Adrenalin, 199 

 Adrenin, 199 

 Aedes, 281 

 Afterbirth, 224 

 Agamodistomum, 450 

 Agassiz, 35 



Agriculture and zoology, 29 

 Alcvonacea, 311 

 Alcyonaria, 311 

 Alisplienoid, 110 

 Allelomorphs, 237 



multiple, 242 

 Alpine zone, 475 

 Alternation of generation, 63 

 Alveoli, 80, 132 

 Amblema, 374 



Ambulacral groove, 363, 366 

 Amino acids, 46, 171, 172 

 Amitosis, 50 



Amnio-cardiac vesicle, 220 

 Amoeba, 285 

 Amoebic dysentery, 279 

 Amoebina, 270 

 Amoebocytes, 367 

 Amoeboid movement, 292 

 Amphiaster, 50 

 Amphibia, 148 



classification of, 103 



economic importance of, 102 



families of, 104 

 Amphineura, 373 

 Amphioxus, 147, 152 



circulatory system of, 156 



habitat of, 152 



in evolution, 484, 485 



reproductive system, 157 



respiratory system, 157 



structure of, 152 



Amphiplexus, 193 

 Amphipods, 411 

 Amylase, 69 

 Amylopsin, 69, 125 



action of, 171 

 Anabolisni, 166 

 Analogous structures, 399 

 Anaphase, 51 

 Anastomosis, 57 

 Anatomy, gross, 19 

 Ancestry of vertebrates, 484 

 Ancylostoma, 427, 438-445 

 Andalusian chicken, 244 

 Androgen, 207 

 Androgenic hormone, 204 

 Androsterone, 204 

 Anemia, 341 

 Annelid theory, 485 

 Annelida, 23, 342 

 Annelids, importance of, 356 

 Annulus, 355, 397 

 Anodonta, 374 

 Anomalies, 226 



cardiac, 234 

 Anopheles, 276, 281 

 Antebrachium, 109 

 Antedon, 361 

 Antelope, 464 

 Antennata, 395 

 Antennules, 398, 399, 401, 404 

 Anthelmintics, 443 

 Anthozoa, 309 

 Anthropoidea, 494 

 Antibodies, 180 

 Antigen, 180 

 Antipathes, 311 

 Antipathidea, 311 

 Antihemorrhagic vitamin, 176 

 Antineuritic vitamin, 174 

 Antipellagric vitamin, 175 

 Antirachitic vitamin, 175 

 Antiscorbutic vitamin, 175 

 Antisterility vitamin, 176 

 Antixerophthalmic vitamin, 174 

 Anus, 109 

 Aortic arches, 221 



development of, 501, 504 

 Appendages, 109 



of crayfish, 397 

 Appendicular skeleton of frog, 86 

 Aqueduct, cerebral, 136 



of Sylvius, 136 

 Arachnid theory of vertebrate ancestry, 

 485 



527 



