GENEEAL INDEX. 



(TEXT AND ILLUSTRATIONS.) 



Figures in italics refer to illustrations ; those in thick type to the 

 pages where technical terms are defined. 



Abdomen of crayfish, 153 

 Aberdeen, 193 

 Aberystwyth, 35, 265 

 Abyssal fauna, 319, 324 

 Acontia, or stinging-threads, 66, 



70 



Adaptive characters, 297 

 Alnmouth, 35, 81, 265 

 Alternation of generations, 17, 64 

 Alveolus of Aristotle's lantern, 



136 

 Ambulacral areas of sea-urchin, 



1 37 / 38 

 Lot t loo 



Ambulacral groove, 127 

 Ampullae of sea-urchin, 138 

 Anal fins of coal-fish, 298 

 Ancestral reminiscence, 327 

 Anchors of Synapta, 144 

 Annuli, or rings, 61 

 Antennae of lobster, 156 

 Antennules of lobster, 156 

 Anus, or posterior opening of the 

 food canal 



of sea-urchin, 137 



of Cucumaria, 143 



of heart-urchin, 141 

 Arctic region, 321 

 Aristotle's lantern, 135, 136 

 Auditory organs of Mysis, 212 

 Autotomy, or self-mutilation, 11, 

 162 ; of Galathea, 176 



Barbule of cod, 301 



of saithe, 298 

 Base of sea-anemone, 65 



Basipodite, 174 



Beaks of mussel shell, 268 



Bilateral symmetry, 143 



Biramose appendages, 161 



Boreal region, 322 



Bournemouth, 35 



Branchial sac of sea-squirt, 292 



Brood pouch of Mysis flexuosa, 



209 



Buccal cavity of Nereis, 87 

 Burrowing animals, 7, 321 

 Bursse of brittle- star, 130 

 Byssus, 270 



of mussel, 267 



Carapace of crayfish, 155 



of crab, 10 



Cardinal teeth of Cyprina, 279 

 Carpopodite, 174 

 Cephalothorax, 153 

 Chelipedes of crayfish, 156, 161 

 Chitin of Crustacea, 150 

 Cirri of Nereis pelagica, 84, 88 



of parapodia, 86, 95, 109 



of Trochus, 235 

 Ccenosarc of Alcyonarians, 75 

 Collar of Sabellids, 116 



of Serpula, 117 

 Column of sea-anemone, 65 

 Commensalism, 187 

 Coxopodite, 174 



Dactylopodite, 174 

 Disc of Ophiura, 130 

 of sea-anemone, 65 



335 



