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 



/IBACTINAL, 376*, 418 



Abdomen, of Aptts, 531 : A*tacu*, 541 : 

 Periplaneta, 020, 622 



Aboral. 376*, 418 



Absorption, 34 



Abyssal species, 8* 



m.cttnthctria, 60 



Acanthin, 61* 



Acanthocephala, 297* : External charac- 

 ters, 312, 313 : Body-wall, 312 : Body- 

 cavity, 313 : Proboscis," 313 : Vessels, 

 313 : Nervous-system, 313 : Excretory 

 organs, 313, 315 : Reproductive 

 organs, 314, 315 : Development, 315 



A'-rinfhobdella, 518, 519 



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

 673 



Achromatin, 17* 



Aciculum, 441* 



Anntta, 99, 100, 101 



Accela, 252, 267, 272 



Acontia, 188*, 201 



' Acorn-shells, 565 



\Actceon, 745 



Actinal, 376*, 418 



Actinia, 193, 228 



Actiniaria, 194*, 196, 197 



Actinobolus, 93, 94 



Actinodactylella, 259, 260, 267, 273 



A <it inometra, 425 



Actinommaasteracanthion, 61, 62 



A'-tinophrys sol, 56, 57, 59 j 



Actinostome, 376* 



'Actinotrocha, 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, 198 : 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 



JEginopsis, 155, 156 



jEginura, 155 



dSquorea, 143 



Affinities See Relationships 



Agalma, 163 



Agamobium, 140*, 176 



Aggressive characters, in Crustacea, 601 



Air-sacs, of Insects, 642 



Albertia, 335 



Altiopida*, 488 



Alcippe, 565, 579 



Alcyonacea, 195, 197, 198, 199, 203 



Alcyonaria, 195*, 196, 197, 199, 200, 201, 

 202, 203, 227 



Alcyonidce, 208 



A Icy on id iu m , 348 



Alcyonium, 195, 203 



Alecithal, 219* 



Alimentary canal See Digestive system 



Alimentary system See Digestive system 



Allolobophoraantiptt, 481 



Alpheus, 602 



