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 Adamsia palliata, 195, 196 



Adductor impressions, 633, 634, 650 

 Adductor muscles, 635, 648, 645, 646, 



647, 649 

 Adhesive cells, of Hormiphora, 202 : of 



Turbellaria, 248 

 Adipose tissue, 23*, 25 

 Adradius, 129 

 Adrectal gland, 693 



144 

 143 



188 : Addenda 

 J<'t/t/orea, 133 



Affinities See Relationships 

 A'galma, 151 

 Agamobium, 130 



Aggressive characters, in Crustacea, 555 

 Air-sacs, of Insects, 593, 594 

 A/liertia, 309 

 Alciopidce, 447 

 Alcippe, 522, 534 

 Alcyonacea, 182*, 195 

 Alcyonaria, 182*, 187, 188, 197 

 Alcyonidium, 320 

 Alcyonium, 182, 190 

 Alecithal, 206* 



Alimentary canal See Digestive system 

 Alimentary system See Digestive system 

 Alphem, 556 

 Alpine forms, 8 



Alternation of generations See Meta- 

 genesis 



Alveolus, of Sea-urchin, 366 

 Ambulacral grooves, 347* 

 Ambulacral ossicles, 349 

 Ambulacral pores, 349 

 Ambulacral system, of Asterias, 350 : 

 Echinus, 367 : Sea-cucumber, 370, 371 : 

 of Antedon, 375 : of Echinodermata, 

 393 



3 c 2 



.BACTIXAL, 347* 



Abdomen, of Apus, 489 ; Astacus, 498 ; 

 Periplaneta, 572, 574 



Absorption, 32 



Abyssal species, 8 



Acanthocepliala, 275* : External charac- 

 ters, 290 : Body-wall, 290 : Body- 

 cavity, 290 : Proboscis, 290 : Vessels, 

 291 : Nervous system, 291 : Excretory 

 organs, 292 : Reproductive organs, 

 291, 292 : Development, 292 



Acarida, 612*, 616, 618, 619, 620, 621 



Achromatin, 15* 



Aciculum, 405* 



Acineta, 90, 91, 92 



Acwla, .252 



Acontia, 175, 188 



Acorn-shells, 534 



Actinal, 347* 



Actinia, 180, 214 



Actiniana, 181, 183, 185, 1SS 



ActinoboliM, 84, 85 



ActinodactyleUa, 244, 245, 251 1 



Actinometra, 392 



Actinomma asteracanthion, 60 



Actinoxthryx sol, 55 



Actinosphcerium, 56 



Actinostome, 347* 



Acfinotrocha, 330, 462 



Actinpzoa, 118*: Example, 172: Dis- 

 tinctive characters and classification, 

 180 : Systematic position of example, 

 183 : General organisation, 183 : Bud- 

 ding, 184 : Structure of polypes, 185 : 

 " it^ric system, 188 : Fixed and free 

 >rms, 189 : Dimorphism, 189* : Skele- 

 m. 189 : Colour, 195 : Commensalism, 

 Distribution, 196 



