INDEX 



(The numbers in italics refer to practical directions.} 



Abdomen, abdominal cavity, 20, 

 361, 434, 483, 506 



Abdominal pore, 432 



Abiogenesis, 288 



Acanthias, 431, 470 



Acetabulum, 50, 503 



Aciculum, 352 



Acoustic spots, 1 88 



Acrania, 421 



Acromion, 500 



Adaptation, 225 



Adenoids, 507, 515 



Adrenal bodies, 145, 447, 538 



Agamobium, 321 



Alimentary canal, see Enteric canal 



Allantois, 597, 601 



ALLOLOBOPHORA, see Earthworm. 



Alternation of generations, 321 



Alveoli of jaws, 510 



Amnion, 597 



AMCEBA : occurrence and general 

 characters, 229 ; movements, 

 232 ; resting condition, 232 ; 

 nutrition, 233 ; growth, 234 ; 

 excretion, 235 ; respiration, 235 ; 

 metabolism, 236 ; reproduction, 

 236 : immortality, 236 ; conjuga- 

 tion, 237 ; death, 237 ; animal or 

 pla'nt ? 255 ; practical directions, 

 238 



Amoeboid movements, 106, 231 



Amphibia, 219, 418, 482 



Amphiccelous, 439 



AMPHIOXUS, see Lancelet 



Ampulla, of semicircular canals, 188 



Ampulla, of sensory canals of the 

 integument, 464 



Anal segment, 327, 352 



Analogous, analogy, 217 



Anatomy, 217 



Angular process, 496 



Animals and Plants : comparison of 

 typical forms, 255 ; discussion of 

 doubtful forms, 255, 257 ; bound- 

 aries artificial, 258 



Ankle, see Tarsus 



Annulata, 220, 249 



ANODONTA, see Mussel 



Anura, 219 



Antenna, 366 



Antennary gland, 375 



Antennule, 366 



Anus, 6, 267, 272, 327, 352, 371, 

 401, 426, 432, 486, 514 



Aorta, aortic arches, see Arteries 



Aperture, or apertures (see also 

 Foramen, and under Nephridium, 

 Kidney, Pores, Reproductive 

 organs, &c.) auditory, Crayfish, 

 381 ; Rabbit, 486, 492, 536; 

 cloacal, see anus ; exhalant and 

 inhalant, 397 



