INDEX 



Abalone, 196 



Abdominal appendages of Insecta, 



243 

 Abothrium, 122, 126 

 Acanthobdella, 153 

 Acanthocephala, 128, 133, 136 

 Acanthocephalus, 136 

 Acanthocystis, 57 

 Acanthonietra, 57 

 Acanthosphaera, 57 

 Acarina, 228, 234 

 Acephala, 184, 186, 201 

 Acephaline gregarines, 44 

 Acerata, 205, 225, 233 

 Acerentomon, 234 

 Acetabulum, 113 

 Acineta, 54, 58 

 Acmaea, 196, 201 

 Acoela, 110 

 Acontia, 99 

 Actinaria, 103 

 Actinomonas, 56 

 Ac'tinophrys, 57 

 Actinopoda, 40, 56 

 Actinosphaerium, 57 

 Actinotrocha, 164 



Adductor muscles of Acephala, 186, 

 187 

 of Brachiopoda, 162 

 Adhesive cells, 101 

 Adjustor muscles, 162 

 Adoral shields, 175 

 Adradii, 96 

 Aeginopsis, 102 

 Aeolis, 201 

 Aeolosoma, 157 

 Aeolosomatidae, 152 

 Aequorea, 102 

 Aerobic respiration, 73 

 Aesthetes, 185 



Agalena, 234 

 Agassiz, A., 167 

 Aglantha, 102 

 Agriolimax, 197, 201 

 Alcyonacea, 103 

 Alcyonaria, 98, 100, 103 

 Alcyonium, 103 

 Allassostoma, 126 

 Allogromia, 57 

 Alternation of generations, 9 



Coelenterata, 90 



Protozoa, 43 

 Alveolar layer of cytoplasm, 50 

 Ambulacral area, 168, 175 

 Ambulacral groove, 169 

 Ambulacral system, 165 

 Ametabola, 238 

 Amicula, 201 

 Amnion, 247 

 Amoeba, 40, 41, 57 

 Amoebida, 57 

 Amoebocytes, 167 

 Amphiblastula, 85 

 Amphilina, 118, 126 

 Amphineura, 185, 200 

 Amphioplus, 175, 182 

 Ampliioxus, 259 

 Amphipoda, 221, 223 

 Amphistomata, 126 

 Amphithoe, 223 

 Amphitrite, 157 

 Ampullae, 83, 155 

 Anaerobic respiration, 73, 246 

 Anal veins, 243 

 Anaplocephala, 122, 126 

 Ancestry of vertebrates, 259 

 Ancylostoma, 132, 136 

 Ancjdus, 197 

 Ancyroccphalus, 113 

 Anisotropic, 66 

 Annelida, 145 



263 



