GENERAL INDEX. xiii 



Page Sec. 



CORALLID/E 68 . 147 



Corallium rubrum . . . . 68 . 148 



Isis hippuris . ,", 68 . 149 



Gorgonia verrucosa 69 . 151 



PENNATULID^: . .' ". ".""T'Y ; / / f ' / % ' / _ >; . . a . . 70 . 153 



TUBIPORIM: i.'., *. y^ 70 . 154 



Tubipora musica . . ..."......,.. 71 . 155 



Anatomy of the polyp of Tubipora . . . ^--vc-'..'..* ; J- .'^ . . 71 . 155 



Growth of the polypary of Tubipora . . . / . . w, ,v ~i . . 72 . 158 



Reproduction and development of Tubipora . .v.- ',"'-,;. . 73 . 162 



ACTINIFORM POLYPS J- f ^:.- . *;^ * -.-" - r- 73 . 163 



Anatomy of Actinia . ...'..'../. .Xa:*. v .- , .... 74 . 164 



Reproduction of Actinia . . . . . . . . _> i /.;*. . 76 . 169 



Development of the embryo i ..;*.;,-. . 77 . 172 



Filiform tubes 78 . 173 



Power of reproducing mutilated parts 79 . 174 



Mechanism of the oral tentaoula 79 . 175 



Filiferous capsules 79 . 176 



CHAPTER V. 



HYDKOZOA. 



H YDROZOA General account of the Hydrce or Fresh-water Polyps . 80 . 177 



Their mode of catching prey .'..''. .... 80 . 179 



Filiferous capsules of the Hydra 81 . 180 



Digestion of food -.;-n-,v, . v . 81 . 181 



Coloured globules 81 . 182 



Eeproduction of Hydra v iridis . . . "" .' '" ' /'-"V 1 ' '-'. ..... 82 . 183 



by external gemmation . . . . . . . . . . . 82 . 184 



mechanical division . '; f -' i rL } '^ */"' i>\' ''.''. . 82 . 186 



ova -.-/'..-.', '.'-; .V . 82 . 187 



Spermatic capsules . .'-"i ' i 83 . 188 



Ovigerous capsules 84 . 189 



Structure of ova 84 . 190 



Hermaphroditism of Hydra viridis . . . ... . ... . 84 . 191 



CORYNB v.K- $*>* ^ '.. . , '. . 84 . 193 



TUBULARIDJE 85 . 194 



Structure of Tubularia indivisa . . . .'"-^ ' ; . l;; v ' '"; ' ;'- f .'" . . 85 . 194 



Propagation of Coryne and Tubularia 86 . 195 



by continuous gemmation 86 . 197 



free gemma? 88 . 201 



simple ova 91 . 212 



SERTULARID.E 92 . 215 



Structure of Sertularia 92 . 217 



Circulation observable in stem 93 . 218 



Growth of polypary 93 . 220 



Structure of polyps 94 . 221 



Structure of tentacula 94 . 222 



Proboscidiform mouth 94 . 223 



Digestive cavity 95 . 224 



Reproduction by cuttings 95 . 226 



the formation of new branches 95 . 227 



Planula . 97 . 230 



of Sertularian zoophytes, according to the observa- 



tions of Lov6n . .97 . 231 



Development of the embryo of Sertularian zoophytes 98 . 235 



CAMPANULARID^: 99 . 243 



Structure of polypary 99 . 244 



Embryogeny of the Campanularian zoophytes 99 . 247 



