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. 



LEAOTINAL, 376*, 418 



Abdomen, of Aptis, 5.31 : Ai/nru-i, 541 : 

 Periplaneta, 620, 622 



Aboral, 376», 418 



Absorption, .34 



Abyssal species, 8* 



Acantharia, 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 



AcanthobdeUa, 518, 519 



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

 673 



Achromatin, 17* 



Aciculum, 441* 



Acmeta, 99, 100, 101 



Acahx, 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 



Actinometra, 425 



Aclinomma asteracanthion, 61, 62 



Actinophrys sol, 56, 57, 59 



Actiiiosphcerium, 57 



Actinostome, 376* 



Actinotrocha, 358, 3.59, 503 



Actinozoa, 128 : Example, 185 : Distinc- 

 tive characters and classification, 193 : 

 Systematic position of example, 196 : 



General organisation, 196 : Budding, 

 197 : Structure of polypes, 1 98 : Enteric 

 system, 201 : Fixed anil free forms, 

 202 : Dimorphism, 2U2 : Skeleton, 

 202 : Colour, 208 : Commensalism. 

 208 : Distribution, 209 



Actinula, 22(5*, 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, 20*, 27 



Adjusters, 364* 



Adradius, 139 



Adrectal gland, 744 



JEginopsis, 155, 166 



^gimira, 155 



Mquorea, 143 



Affinities — See Relation.ships 



Agalma, 163 



Agamobium, 140*, 176 



Aggressive characters, in Crustacea, 601 



Air-sacs, of Insects, 642 



AlheiHa, 3.35 



Alciopida', 488 



Alcippe, 565, 579 



Alcyonacea, 195, 197, 198, 199, 203 



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

 202, 203, 227 



Alcyonida, 208 



Alcyonidium, 348 



Alcyonium, 195, 203 



Alecithal, 219* 



Alimentary canal— -See Digestive system 



Alimentary system — See Digestive system 



Allolohophnra antipa;, 481 



Alpheus, 602 



