INDEX 



References to directions for the study of forms are indicated by the use of 



bold-faced type for the page number. 



ACANTHOCEPHALA, 79 



Acarina, 166 

 Acineta, 19 

 Acinetaria, 19 

 Acmaea, 123 

 Acnidosporidia, 20 

 Acridium, 200 

 Actiniaria, 42 

 Actinomyxida, 20 

 Actinophrys, 18, 24 

 Actinopoda, 18 

 Actinosphaerium, 18, 24 

 Actinotrocha, 231 

 Actinozoa, 42, 59 

 Adelea, 20 

 Adeleida, 20 

 Aeginopsis, 41 

 Aeolis, 123 

 Agalena, 166 

 Alcyonacea, 42 

 Alcyonaria, 42, 61 

 Alcyonium, 42 

 Alectrion, 143 

 Algae, 21 



Amaroucium, 232, 240 

 Amoeba, 18, 22 

 Amoebaea, 18 

 Amphineura, 122, 142 

 Amphioxus, 232, 243 

 Amphipoda, 166 

 Amphitrite, 90, 100 

 Annelida, 90 

 Anoplodactylus, 166 

 Anostraca, 165 



Antedon, 212 

 Anthomedusae, 41 

 Antipatharia, 42 

 Apis, 206 

 Aplacophora, 123 

 Aplysina, 36 

 Apoda, 212 

 Appendicular a, 232 

 Appendix, 245 

 Apus, 165 



Arachnida, 166, 189 

 Araneida, 166 

 Arbacia, 211, 220 

 Arcella, 18, 23 

 Archi-annelida, 90 

 Archi-chaetopoda, 90 

 Arenicola, 90, 102 

 Argonauta, 124 

 Argulus, 187 

 Armata, 90 

 Artemia, 165 

 Arthropoda, 165 

 Articulata, 86 

 Ascaris, 79 

 .Ascidiacea, 232 

 Ascidian, 234 

 Aspidobranchia, 123 

 Asterias, 211, 212 

 Asteroidea, 211, 212 

 Astrangia, 42, 61 

 Astropecten, 211 

 Astrophyton, 211 

 Aurelia, 42, 55 

 Autolytus, 90, 95 



269 



