INDEX. 



Acanthocephala, 51 ; hooks, 28? ; 



gonads, 489 



Acanthometra, 27 ; skeleton, 276 

 Acarina, 74 ; respiration, 228 

 Achseta ; cilia, 56 

 Achtheres ; gnathites, 179 

 Acineta, 31 ; suckers, 177 

 Acipenser, 91 ; skull, 326 

 Acraspedota, 42 ; nervous system, 



395 



Actinophrys, 27 

 JErobranchiata, 73 

 Alcippe, 69 



Amblystoma ; oral glands, 158 

 Amia, 92 



Ammothoa ; figure, 72 

 A.mniota, 93 

 Amoeba ; structure, 18 ; zoological 



position, 27 ; respiration, 210 ; 



ectosarc, 274 

 Amphibia, 89, 93; teeth, 145; 



tongue, 154 ; oral glands, 158 ; 



heart, 195, 202 ; respiration, 232, 



236 ; kidneys, 259 ; glands, 266 ; 



vertebral column, 314, 321 ; 



skull, 330; mouth, 336 ; scales, 



365 ; brain, 421 ; sensor v organs, 



436, 454, 467 ; gonads, 506 

 Amphioxus ; segmentation, 32, 87 

 Amphipoda, 70 

 Amphiuma, 93 ; blood corpuscles, 



Amphonyx ; proboscis, 132 

 Ampullaria ; respiration, 228 

 Anabas, 93 ; suprabranchial organ, 



234 

 Anguillulidffi ; oral bristles, 114 ; 



respiration, 211 

 Anisopleura, 81 

 Annulata, 54; digestion, 117; 



gills, 218; skeleton, 286; eyes, 



446 ; gonads, 489 

 Anodon, 80 ; blood-vessels, 191. 

 Anoplophrya ; figure, 104 

 ^.ntedon, 63; nervous system, 



409 ; copulation, 492 



jj* 16 



Anthozoa, 43 ; mouth, 110 ; sipho- 

 noglyphe, 111 ; figure, 112 ; 

 yellow cells, 272 ; skeleton, 280 ; 

 muscles, 373 ; gonads, 484 



Anthropoidea, 100 



Anura ; respiration, 236 ; kidneys, 

 259 ; testes, 506 



Aphrodite, 54; cseca, 118 



Aplysia, 81 ; intestine, 137 



Appendicularia, 87 ; heart, 193 ; 

 house, 313 



Aptera ; zoological position, 75 ; 

 gnathites, 128 ; springs, 379 



Apus ; nervous system, 405 ; ova, 

 494 ; carapace, 299 



Arachnida ; organisation, 72 ; para- 

 sitic, 180; heart, 190; respira- 

 tion, 225 ; limbs, 377 ; gonads, 499 



Area ; gills, 220 



Arenicola; gills, 219 



Argon auta; shell, 309 



Argulus ; guathites, 180 



Arthropoda, 64; gnathites, 122; 

 blood-vessels, 187 ; tracheae, 215 ; 

 stigmata, 216 ; renal organ, 256; 

 skeleton, 291; locomotion, 375; 

 nervous system, 405 ; sensory 

 organs, 434, 438, 418, 461 ; go- 

 nads, 494 



Artiodactyla, 99 ; limbs, 357 



Ascaris, 51 



Ascefcta ; figure. 35 



Ascidia, 88 ; atriopore, 231 



Ascon, 35 



Asiphoniata, 80 



Aspidogaster, 49 



Asterias, 63 ; figure of arm, 61 ; 

 skeleton, 294 



Astropecten, 63 ; figure, 59 ; loss 

 of anus, 121 



Atlanta, 82 



Aurelia, 42 ; figure, 42 ; respira- 

 tion, 211 ; gelatinous tissue, 

 286 ; nervous system, 395 



Axolotl ; oral glands, 158 



Azygobranchiata, 82 



