INDEX. 



Glossoconus canadensis, 418 



Gonads, position of, secondary : of Slabbena halter 

 ata,76; perradial.in Rathkea,l8o; migration 

 in Obelia, 246, 253, 254; in Oceanidae, 103 

 Gonionema, 341 



murbachii, 343 

 vertens, habits of, 343 

 Goneomeandrus, 219 



chrysostephanus, 220 

 Gonionemoides, 350 



geophila, 351 

 Gonionemus, 12, 341 

 agassizii, 342, 348 

 depressus, 342, 348 

 grafting of, 346 

 hornelli, 342, 35° 

 murbachii, 342, 343, 49 8 

 nervous system, 346 

 pelagicus, 342, 3+9 

 suveensis, 342, 349 

 vertens, 342, 343 

 Gonynema, 341 

 Goodsirea, 293 



mirabilis, 294 

 Gossea, 13, 367 



brachymera, 368 

 circiniata, 367 

 corynetes, 367 

 Growth, rate of in hydroids: Sarsia, 58; bou- 



gainvillia, 162; Obelia, 246 

 Gymnopthalmae, 17 



Habits: Collapsing of Dipleurosoma, 226; Egg- 

 laying of Stomotoca, 113; Oceania, 148; 

 #,quorea, 328; Gonionemus, 344; Linope, 

 414; Geryonia, 426; Feeding of Zanclea, 89; 

 Turris, 126; Swimming of Obelia, 243; Gon- 

 ionemus, 344; Cubaia, 351; Olindias, 355; 

 Craspedacusta, 365 

 Halatractus, 31 

 Halcor,dyle tiarella, 25 

 Halicalyx, 352 



tenuis, 354 

 Halicreas, 14, 39° 

 alba, 393 

 conica, 394 

 glabrum, 392 

 minimum, 391 

 papillosum, 391 

 racovitzee, 393 

 rotundatum, 392 

 Haliscera, 390 



conica, 394 

 Halitiara, 105 



formosa, 107 

 Halitrephes, 394 



maasi, 394 

 Halmomises, 198, 199 



lacustris, 199 

 Halocharis, 85 

 spiralis, 72 



Halopsis, 286, 323 

 annae, 287 



cruciata, 277, 285, 287, 2SS, 323 

 megalotis, 289 

 ocellata, 323 

 Hebella calcarata, 202 

 Hermaphroditism: Eleutheria, 84; Cladonema, 



99; Amphogona, 405, Appendix, 497 

 Heterostephanus, 29 

 Heterotiara, J, 107 



anonyma, 107, Appendix, 489 

 Hippocrene, 155 

 aurea, 162, 164 

 bougainvillii, 162 

 britannica, 161 

 carolinensis, 165 

 crucifera, 174 

 macloviana, 160 

 octopunctata, 177 

 platygaster, 165 

 pyramidata, 168 

 superciliaris, 162 

 Homa-onema, 14, 377, 3S3, 390 

 alba, 393 

 amplum, 387 

 elongatum, 379 

 macrogaster, 388 

 militate, 387 

 plaiygonon, 386 

 racovitza;, 393 

 typicum, 384, 3S3 

 Hybocodon, 5, 37 



amphipleurus, 39 

 annulicornis, 39 

 chilensis, 42 

 christnnr, 42 

 forbesn, 42 

 gravidum, 39 

 islandicus, 39 

 januarti, 23 

 occidentalis, 42 

 pendula, 41 

 pendulus, 41 

 prolifer, 



pulcher, 43 



annus, 4 2 

 Hydractena, 458 

 Hydractinia areolata, 140 

 Hydrichthys, 5, 66 



minis, 67 

 Hyiroctena, 15, 44^, 45 s 



salenskn, 43Q 

 Hydromedusee, 5 



Irene, 311 



ceylonensis, 309 



ccerulea, 304 



gibbosa, 307 



mollis, 311 



palkensis, 309 



pellucida, 314, Appendix, 496 



[vii] 



