INDEX 



{The iiiunbers in italics refer to practical dii'cctioiis.) 



A. 



i^bdomen, abdominal cavity, 20, 

 347, 418, 467, 489 



Abdominal pore, 416 



Abiogenesis, 282 



Acanthias, 415, 454 



Acetabulum, 50, 4S6 



Achromatin, 129, 231, 541, 542 



Acoustic spots, 188 



Acrania, 406 



Acromion, 483 



Adaptation, 224 



Adenoids, 498 



Adrenal bodies, 145, 431, 521 



Agamobium, 314 



Alimentary canal, see Enteric canal 



Allantois, 579, 583, 387 



Allolobophora, see Earthworm. 



Alternation of generations, 314 



Alveoli of jaws, 493 



Amnion, 579, ^8j 



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 

 plant ? 255 ; practical directions, 

 238 



Amceboid movements, 106, 231 



Amphibia, 219, 403, 466 



Amphicffilous, 423 



Amphioxus, see Lancelet 



Ampulla, of semicircular canals, 

 188 



Ampulla, of sensory canals of the 

 integument, 448 



Anal segment, 319 



Analogous, analogy, 217 



Anatomy, 217 



Animals and Plants : comparison of 

 typical forms, 255 ; discussion of 

 doubtful forms, 255, 257 ; bound- 

 aries artificial, 258 



Ankle, see Tarsus 



Annulata, 220, 341 



Anodonta, see Mussel 



Anura, 219 



Antenna, 352 



Antennary gland, 361 



Antennule, 352 



Anus, 6, 267, 276, 319, 357, 386, 

 416, 429, 469, 497 



Aorta, aortic arches, see Arteries 



Aperture, or apertures (see also 

 Foramen, and under Nephridium, 

 Kidney, Pores, Reproductive 

 organs, &c. ) auditory, Crayjish, 

 367 ; Rabbit, 470, 472 ; cloacal, 

 see anus ; exhalant and inhalant, 

 3S2 



