INDEX 



NOTE : A numeral in parentheses refers to a color plate; a page number followed 

 by an asterisk indicates a black-and-white illustration. 



Abalones, 178* 

 Acanthohdella. 208 

 Acanthocephala. 15. 142 

 Acaiilhoptiliim. 103 

 Acluitimi. 177. 183 (49) 

 Acinaea. 179*. 181* 

 Acoels. 120 (36) 

 Acorn worm. 146*, 147* 

 Acropoia. 113 (31) 

 Actinophrys. 3 1 

 Actinopyga. 273. 275 

 Actinosphaeriiini, 31 

 Actinozoa. 97 

 Adanisia. 105 

 Aeolis, 182 

 Aequorea, 72 

 African sleeping sickness, 26, 



27* 

 Aglaophenia, 11 

 Albatrossaster, 111 

 Alcyonaceans, 99, 100* 

 Alcyonaria, 98 

 Alcyoniiim. 99*, 102 (9) 

 Allopom. 75 

 Alpheus. 237 

 Ainaroiiciiiin, 287 

 Amebas, 28* 

 Amebiasis. 29 

 Amoeba. 19, 20, 28*, 29 

 Amphihelia, 110 

 Amphineura. 159 

 "Amphioxus." 289 

 Amphipholis, 285 



Amphipodu. 234 

 A mphiporus. 131*, 132 

 Ainphiscolops. 121 

 Aiuphitiite. 206* 

 Ancylostoma, 137 

 Anemones, see Sea anemones 

 Anemonia. 106 (14)( 19) 

 Annelida. 15. 200, 205* 

 Anodonia, 192 

 Anomia, 188 

 Anopheles, 49 

 Anseropoda. 278 

 Antedon. 256, 274* 

 Antennae, 226 

 Anthomastiis, 101 

 Anthopleiira. 106. 107* (13) 

 Anthozoa. 97 

 Antipatharians, 1 13 

 Aphrodite, 202 (85) 

 Aplacophora, 160 

 Aplysia (60) 

 Appendicuiarians, 287 

 Arachnida, 243 

 Araneae, 243 

 Arcella, 29 

 "Archiannelids." 204 

 Architeiilhis. 197 

 Arenicola, 203 

 Argiope, 244* 

 Argonaula, 199 

 Argtdus, 232 

 Argyronecki, 244 

 Argyrotheca, 155 



Arioliinax, 185* 

 /l/7o/( (71 ) 



"Aristotle's lantern," 281 

 Armadillidhim, 234. 236* 

 Arrow worms, 144*, 145* 

 Arteinia, 229* 

 Arthropoda, 15, 226 

 Articulata. 155 

 Ascarids. 133 

 A scar is, 133. 136 

 Aschelminthes. 133 

 Ascoinorphu, 139 

 Asconenia, 61 

 AseUiis, 234 



Asexual reproduction, 20 

 Astacopsis, 238 

 Astacus, 231 



Asterias, 279, 280* (124) 

 Asterina. 278 

 Asteroidea. 276 

 Astruiigia, 110, II 1* 

 Aslroides. 1 1 1 (24) 

 Astrometis, 279 

 Astropecten, 277 

 Atolls, 113 

 Atrium. 286 

 Auger snails, 177 

 Aurelia, 76*, 80 

 Aviciilaria, 245 

 Avicularium, 151 

 "Avoiding reaction," 52 

 Axinella (3) 



[293 



