INDEX 



Names of genera are printed in italics 



Abactinal, 108 



Aboral, 108 



Abyssal zone, 185, 253 



Acalephas, 73 



Acanthin, 29 



Acanthopores, 192 



Acanthoceras, 278 



Acanthotelson, 323 



Acanthoteuthis, 287 



Acanthothyris, 182 



Acarina, 354 



Acaste, 307 



Acephala, 200 



Acervularia, 88 



Acetabulum (Echinoidea), 122 



Acidaspis, 309 



Acorn shells, 316 



Acrosalenia, 127 



Actceon, 249 



Actinal surface, 108 



Actinaria, 77 



Actinocamax, 284 



Actinoceras, 264 



Actinocrinus, 141 



Actinometra, 145 



Actinopteria, 214 



Actinostroma, 71 



Actinozoa, 71-104 



Ad-ambulacral plates, 108 



Adductor impressions, 202 



Adductor muscles, 165, 166, 200, 



313, 319 

 JF,ger, 329 

 JEglina, 307 

 JEgoceras, 275 

 JEquipecten, 215 

 Agelacrinus, 157 



Aglaophenia, 55 



Aglaspis, 343 (footnote) 



Agnostus, 303 



Alar fossula, 78, 85 



Alar septum, 84 



Alaria, 244 



Alcyonaria, 93-98, 103 



Alcyonium, 94, 103 



Alectryonia, 217 



Allorisma, 230 



Alveolaria, 195 



Alveolina, 22 



Alveolites, 99 



Alveopora, 98, 99 



Amaltheus, 276 



Amber, 5, 333-337, 354 



Amberleya, 240 



Ambony cliia, 230 



Ambulacral area, 118-120, 124, 

 156 

 „ groove, 108, 112, 157 



,, ossicle, 108, 113 



plate, 118-120, 140 

 ,, surface, 108 



Ambulacrum = ambulacral area 



Ammonites, 272 (footnote) 



Ammonoidea, 266, 285 



Amnigenia, 230 



Amoeba, 15 



Amphidromus, 255 



Amphipoda, 326 



Amphipora, 73 



Amphistegina, 24 



Amphiura, 115 



Amphoracrinus, 142 



Amplexus, 91 



Ampulla, 110 



24—2 



