_Echinella_, 199. _elegans_ (_Plumatella_), 224. Eleutheroblastea, 146, 147. emarginata (Plumatella), 4, 8, 9, 10, 23, 188, 218, ~220~, 245. _emarginata_ var. _javanica_ (_Plumatella_), 221. Entoprocta, 183. Ephydatia, 64, ~108~, 242. _erinaceus_ (_Spongilla_), 114. Eunapius, 63, ~86~, 241. Euspongilla, 63, 67, ~69~, 241. filamentata (Syncoryne), 22, 140. fluviatilis (Ephydatia), 109, ~242~. _fluviatilis_ (_Meyenia_), 242. fluviatilis (Spongilla), 108, 242. _fluviatilis_ var. _gracilis_ (_Meyenia_), 242. fortis (Ephydatia), 52, 53. fragilis (Spongilla), ~95~, 96. fragilis _subsp._ calcuttana (Eunapius) (Spongilla), 9. fragilis _subsp._ calcuttana (Spongilla), 22, 63. fragilis _subsp._ decipiens (Spongilla), 22, 63. Fredericella, 188, ~208~, 245. FREDERICELLIDÆ, 188, ~208~. _friabilis_ (_Spongilla_), 87. fruticosa (Plumatella), 4, 7, 8, 9, 23, 188, ~217~, 218. _fusca_ (_Hydra_), 158, 159. Gecarcinucus, 10. gemina (Eunapius) (Spongilla), ~8~. gemina (Spongilla), 22, 63, ~97~. _glomerata_ (_Spongilla_), 95. _grisea_ (_Hydra_), 148, 149. Gymnolæmata, 184, 187. Halichondrina, 65. hemephydatia (Euspongilla) (Spongilla), 8. hemephydatia (Spongilla), 22, 63, ~82~. _hexactinella_ (_Hydra_), 148. himalayana (Lophopodella), 233. himalayana (Stolella), 246. _himalayanus_ (_Lophopus_), 233. Hislopia, 187, ~199~. Hislopidées, 199. HISLOPIIDÆ, 187, ~199~. Homodiætidæ, 191. _Hyalinella_, 212. Hydra, 146, ~147~, 245. Hydraidæ, 147. HYDRIDÆ, 146, 147. hydriforme (Polypodium), 142. Hydrozoa, 146. _indica_ (_Ephydatia_), 83. indica (Fredericella), 9, 23, 188, ~209~, 245. indica (Spongilla), 22, 63, ~100~. indica (Stolella), 4, 9, 23, 188, ~229~. indica (Stratospongilla), (Spongilla), 9. javanica (Plumatella), 4, 8, 9, 23, 188, ~221~, 222. kawaii (Limnocodium), 141. lacroixii (Membranipora), 23. lacustris (Cordylophora), 141. _lacustris_ (_Euspongilla_), 69. lacustris (Hislopia), 4, 8, 9, 23, 187, 199, ~202~, 204. lacustris (Spongilla), 63, 67, ~69~. lacustris _subsp._ moniliformis (Hislopia), 9, 23, 187. lacustris _subsp._ reticulata (Spongilla), 4, 8, 9, 22, 63, ~71~, 241. _lacustris_ var. _bengalensis_ (_Spongilla_), 77. lapidosa (Corvospongilla), 9, 22, 64, ~124~. _lapidosa_ (_Spongilla_), 124. latouchiana (Trochospongilla), 4, 8, 9, 22, 64, ~115~. _leidyi_ (_Trochospongilla_), 115. _lendenfeldi_ (_Lophopus_), 233. _lendenfeldi_ var. _himalayanus_ (_Lophopus_), 233. lobosa (Spongilla), 89. LOPHOPINÆ, 188, 211, ~231~. Lophopodella, 8, 188, ~231~. _Lophopus_, 8, 232. _lordii_ (_Spongilla_), 95. loricata (Spongilla), ~122~. _loricata_ var. _burmanica_, (_Spongilla_), 122. _lucifuga_ (_Plumatella_), 217, 220, 224.