INDEX 



All numbers refer to pages. Words in italics are names of families, genera, 

 species, or of higher divisions. Numbers in thick type are numbers of pages on 

 which there are figures. 



Aard varks, 644. 



Absorption, 482. 



Acanthiidce, 348. 



Acanthoccphala, 180. 



Acanthodactylus, 538. 



Acanthopterygii, 444. 



Acarina, 370381. 



Accipiter, 605, 606. 



Accretion, 10. 



Acetabulum, 404, 496. 



Achorutes, 338. 



Achtheres, 294. 



Acicula, 235. 



Acinonyx, 656. 



Acipenser, 453; Acipenseridce, 443, 453. 



Actnaa, 258. 



Accelomata, 241. 



Acontia, 136. 



Acraspedote, 129. 



Acridiidce, 345; Acridium, legs, 332. 



Acris, 512, 519, 520. 



Actiniaria, 135, 141. 



Actinomma, 40. 



Actinophrys, 40. 



Actinosphcerium, 40. 



Actinozoa, 133. 



Actitis, 607, 608. 



Adductor muscles, 244, 245. 



A delochorda, 3 86 . 



Adephaga, 360. 



Admetus, 381. 



Adrenals, 492. 



JEpyornis, 589; jEpyornithiformes, 589, 



598. 



Agamida, 537, 553. 

 Agelenida, 377. 

 Agkistrodon, 539; .4. contortrix, 566; -^ 



pisciwrus, 565, 566. 



703 



, 512, 518; Aglossidce, 512, 518. 

 Aglypha, 539, 560. 

 Air-bladder, 433, 439; -sac, 585. 

 Aix, 603. 

 AlaudidcB, 591. 

 Albatross, 590, 600. 

 AkedinidcE, 591, 611; Alces, 644; 



Alcidce, 590, 607, 609. 

 Alces, 669. 



Alcyonacea, 139, 140. 

 Alcyonaria, 139. 

 Alcyonium, 139, 140. 

 Aletia, 354. 

 Alimentary canal, 405 (see digestive 



system). 



Allantois, 680, 681. 

 Alligator, 536, 547, 548, 549. 

 Allogromia, 41. 

 Allolobophora, 215, 236. 

 Alouatta, 664. 

 Alpheus, 297. 

 Alternation of generations, 81, 122, 



132. 



Alytes, 512, 522. 

 Ambloplitcs, 467. 

 Amblyoposidce, 444, 462 ; Amblyopsis, 462, 



463- 



Amblyrhynchits , 554. 

 Ambulacral grooves, 191. 

 yl mbystoma, 511,516; ^1 mbystomida, 511, 



Ameba proteus, 27-39; anatomy, 28; 

 behavior, 33 ; locomotion, 35 ; metab- 

 olism, 29; reproduction, 32. 



Ameiurus, 457. 



Ameiva, 538. 



A metabola, 334. 



w, 454, 455; Amiida, 443, 454- 



