INDEX 



All numbers refer to pages : words in italics are names of families, genera and 

 species: words in thick type are names of higher divisions: words in small 

 capitals are names of examples. Numbers in thick type are numbers of pages on 

 which there are figures : an asterisk after a number indicates a definition of the 

 term or of the group. 



A, 



lBactinal, 376*, 418 



Abdomen, of Aptu, 531 i Attacue, f>41 : 

 Periplaneta. 820, 622 



Aboral. 376*, 418 



Absorption, 34 



Abyssal species, 8* 



Aiiiiitharin, 60 



Ai anthin, 61* 



Acanthocephala, 297* : External charac- 

 ters. 31$ 313 : Body-wall, 312 : Body- 

 cavity, 313 : Proboscis, 313 : Vessels, 

 313 : Nervous-system, 313 : Excretory 

 organs, 313, 315 : Reproductive 

 organs, 314, 315 : Development, 315 



Acatdhobdella, 518, 519 



Acarida, 661*, 665, 667, 668, 669, 672, 

 673 



Achromatin, 17* 



Aciculum, 441* 



Adaeta, 99, 100, 101 



Acaia, 262, 267, 272 



Acontia, 188*, 201 



Acorn-shells, 565 



Actceon, 745 



Actinal, 376*, 418 



Actinia, 193, 228 



Actiniaria, 194*, 196, 197 



Acttnobohu, 83, 94 



ArimodnrtyleUa, 259, 260, 267, 273 



Actinometra, 42.~> 



A'/iitomni't astterarniithion, 61, 62 



Actinojihrys sol, 56, 57, 59 



Acfinosphmrium, 57 



Actinostome, 376* 



Aclinotrocha, 358, 359, 503 



Actinozoa, 128 : Example, 185 : Distinc- 

 tive characters and classification, 193 : 

 Systematic position of example, 196 : 



General organisation, 196 : Budding, 

 197 : Structure of polypes, 19S : Enteric 

 system, 201 : Fixed and free forms, 

 202 : Dimorphism, 202 : Skeleton, 

 202 : Colour, 208 : Commensalism. 

 208 : Distribution, 209 



Actinula, 226*, 229 



Adamsia palliata, 208, 209 



Adductor impressions, 682, 683, 694, 

 697, 698, 699 



Adductor muscles, 683, 697, 698 



Adhesive cells, of Hormiphora, 215*: 

 Turbellaria, 264 



Adipose tissue, 26*, 27 



Adjusters, 364* 



Adradius, 139 



Adrectal gland, 744 



JSgkioptia, 155, 156 



Alyinura, 155 



dlq norea, 143 



Affinities — See Relationships 



A yalma, 163 



Agamobium, 140*, 176 



Aggressive characters, in Crustacea, 601 



Air-sacs, of Insects, 642 



Albert ia. 335 



Atciopidce, 488 



Aleippe, 565, 579 



Alcyonacea, 195, 197, 198, 199, 203 



Alcyonaria, 1!)5*, 196, 197, 199, 200, 201, 

 202, 203, 227 



Alcyonidir, 208 



Alcyonidium, 348 



Alcyonium, 195, 203 



Alecithal, 219* 



Alimentary canal — See Digestive system 



Ali mentary system — See Digesti ve system 



Allolobophnra antipir, 481 



Alpfieti*, 602 



