INDEX. 



Aardvark, 563 

 Abalone, 326, 333 

 Abdominal cavity, 555 

 Abdominal fin, 462 

 Abdominalia, 374 

 Abdominal pores, 481 

 Abducens nerve, 471 

 Abiogenesis, 127 

 Abomasus, 568 

 Acanthia, 428 

 Acanthias, 507 

 Acanthin, 176 

 Acanthobothrium, 254 

 Acanthocephala, 268 

 Acanthocystis, 175 

 Acanthoderus, 39 

 Acanthodidse, 507 

 Acanthometra, 177 

 Acanthopleura, 315 

 Acanthopteri, 510 

 Acanthopterygii, 511 

 Acaridte, 397 

 Acarina, 396 

 Accessory chromosome, 

 Accessory nerve, 471 

 Accipiter, 544 

 Acephala, 317 

 Acerata, 387 

 Acerentomon, 419 

 Acetabulum, 248 

 Achasta, 281 

 Achatina, 336 

 Athoreutes, 419 

 Achromatin, 56 

 Achtheres, 28, 370 

 Acineta, 198 

 Acinetaria, 197 

 Acinous glands, 63 

 Acipenser, 50) 

 Acmsea, 333 

 Acontia, 226 

 Acrania, 439 

 Acridium, 421 

 Acris, 520 

 Acrodont, 529 



A( tinaria, 231 

 Actinophrvs, 175 

 Actinopoda, 308 

 Actinospruerium, 173 

 Actinotrichia, 463 

 Actinotrocha, 287 

 Actinozoa, 224 

 Ai uleata, 426 

 Aculeus, 413, 425 

 Acustic nerve, 471 

 Adambulacral plates, 296 

 Adamsia, 227 



Adductor muscle, 228, 318 

 /^ga, 386 

 /Egina, 218 

 /ginopsis, 214 

 /Solids, 335 

 yEolidia, 335 

 /Epiornis, 542 

 y^Equoria, 214, 218 

 ^Eschna, 420 

 Esthetes, 315 

 /Ethalium, 181 

 73 After-shaft, 534 

 Agalmia, 219 

 Agamidae, 529 

 Agelacrinoidea, 302 

 Agelacrinus, 303 

 Agkistrodon, 531 

 Aglaophenia, 218 

 Aglossa, 520 

 Aglypha, 531 

 Agrion, 420 

 Air bladder, 502 



cells, 482 



pipes, 538 



sacs of birds, 538 

 Ahe, 408 

 Alse cordis, 412 

 Alauda, 544 

 Albatross, 543 

 Albumen gland, 249 

 Alca, 543 

 Alcedinidffi, 544 

 Alces, 569 



581 



Alciopida?, 277 

 Alcyonaria, 230 

 Alcyonidse, 230 

 Alcyonidium, 287 

 Alcyonium, 227, 230 

 Alecithal, 143 

 Aleppo evil, 184 

 Aletia 433 

 Alima, 376 

 Alisphenoid, 458 

 Allantois, 490 

 Allelomorphs, 138 

 Alligator, 532 

 Alligator turtle, 527 

 Allobophora, 279 

 Alloposus, 347 

 Alosophila, 433 

 Alpaca, 569 

 Alpheus, 380 

 Alternation of generations, 



Altrices, 541 

 Alula, 534 



Alveolar duct, 482, 555 

 Alveoli, 482, 532 

 Amaroucium, 446 

 Ambergris, 572 

 Amblyopsidie, 510 

 Amblypoda. 570 

 Amblystoma, 27, 520 

 Ambulacral system, in, 



292, 296 

 Ameiva, 528 

 Ametabolous, 414 

 Amia, 32, 508 

 Amicula, 316 

 Ammocoetes, 493 

 Ammonitidae, ,u (l 

 Anr.ion, 414, 4' ; <) 

 Amniota, 520 

 Amniotic fluid, 490 

 Amoeba, 53, 171, 172 

 Amcebina, 172 

 Amoeboid motion, 53, in 

 Amphiaster, 60 



