338 



LIFE BY THE SEASHORE. 



Siphon of whelk, 234, 844 



Siphonoglyphes, 66 



of Actinoloba dianthus, 74 



Skin-gills, 128 



Spawn of Doris, 253 



of Doto coronata. 259 



Spicules of Alcyonium, 75 



Spicules or needles of sponges, 36 



Sporosacs of sea-firs, 41> 42, 46, 

 48, 49, 50, 58 



Squame of crayfish's antenna, 156 



Stinging-cells, 29 



Stolons, basal connecting pro- 

 cesses of sea-firs, shown in 

 Figs. IX. and XVII., 29, 51 



Stone canal of sea-urchin, 138 



Sub-chelate, 169 



Sub-equivalve, 275 



Swimmerets, 154, 156 



Swimming movements of Deca- 

 pods, 253 [13 



Symbiosis or animal partnerships, 



Tail fan of crayfish, 157 



Teeth of Cyprina islandica, 279 



of Ophiura, 131 



of sea-urchin, 136 

 Teignmouth, 35 

 Telson, 155 



of Mysis, 212 

 Tenby, 35 



Tentacle scales of Ophiura, 130 

 Tentacles of Cucumaria, 143, 

 144, 145 . 



Tentacles of heart-urchin, 142 

 Tentaculocysts of Aurelia, 77 

 Test of common sea-urchin, 135 

 of Echinocardium cordatum, 

 of Tunicate, 291 [140 



Thoracic membrane of Serpula, 



117 



Tooth-papillse of brittle-stars, 131 

 Torbay, 264 

 Torquay, 35, 63, 193 

 Tube of Pectinaria belgica, 114 

 of Pomatocerostriqueter, 117 

 of Serpula vermicularis,\!7 

 Tube-feet of Asterias rubens, 126, 

 of Cucumaria, 144 [127 

 of heart-urchin, 142 

 of Ophiothrixfragilis, 130 

 of sea-urchin, 137 



Uropods, 157 



Velum, or veil, of medusoids, 47 

 Ventral fin of coal-fish, 298 



"Water-vascular system, 126 

 Weymouth, 35, 264 

 Whitby, 35 

 Woolacombe, 289 



Zoea, 205 



of Thiapolita, 328 

 Zooid, a member of an animal 

 colony, 41 



