CONTENTS. 



Page 



INTRODUCTION 175 



Calycophorae 178 



Sphaeronectidae 182 



Sphaeronectinae 182 



.Sphaeronectes Huxley 182 



truncata (Will) . . .184 



Muggiinae 185 



Muggiaea Busch 185 



atlantica Cunningham . . 187 



kochii (Will) 188 



Cuboides Quoy and Gaimard . . . 189 

 vitreus Quoy and Gaimard . 190 



Nectopyramidinae 191 



Neetopyramis Bigelow 191 



diomt'deae sp. nov. . . 191 



Prayidae 194 



Amphicaryoninae 194 



Araphicaryon Chun 195 



acaule Chun .... 195 



Prayi.nae 197 



Praya BlainviUe 200 



cymbiformi.s (Delle Chiajp) . . 200 



Rosacea Quoy and Gaimard . . . .201 



?plicata Quoy and Gaimard . 201 



medusa (Metschnikoff) . . 203 



Nectodroma, gen. nov. 204 



dubi a (Quoy and Gai mard ) 204 

 reticulata, sp. nov. . . 20(5 



IIippopodiidae 207 



Hippopodius Quoy and Gaimard . . 207 

 hippopu.s (Forskai) . . 208 



Vogtia Kolliker 210 



spinosa Keferstein and Ehlers . 210 



DiPHYID.iE 213 



Abylinae 213 



Key to the polygastiic stale. 215 



Abyla Quoy and Gaimard 21f) 



leuckartii Huxley 210 



trigona Quoy and Gaimard . . 221 

 haeckeli Lens and Van Hiem.sdijk 222 



Abylopsis Chun 224 



tetragona (Otto) .... 224 

 eschscholtzii (Huxley) . . . 226 



Bassia L. Agassiz 229 



bassensis (Quoy and Gaimard) . 229 



Page 

 Diphyabyla Lens and Van Uiem.sdijk . 231 

 hubrechti Lens and \im 



Riera.sdijk 231 



Galeolariin.ae 233 



Galeolaria BlainviUe 233 



Key to the species 236 



Galeolaria quadrivalvis (BlainviUe) . 237 

 australis Quoj' and Gaimard 238 



monoica Chun 239 



DiPHYOPSIINAE 240 



Key to the species 246 



Diphyes Cuvier 248 



appendiculata Esehsfholtz . . 248 



spiralis, sp. nov 249 



bojani (Chun) 251 



contorta Lens and ^"an Riems- 



dijk 254 



fowleri Bigelow 255 



Diphyopsis Haeckel 257 



dispar (Chamisso and Eysen- 



hardt) 257 



mitra (Huxley) .... 258 

 Chuniphj-es Lens and Van Riemsdijk . 261 

 multidentata Lens and ^'an 



Riemsdijk 262 



Ersaea bojani (Eschseholtz) .... 264 



Archisoma, gen. nov 266 



natans, sp. nov 266 



Physophorae 267 



forskaliidae 269 



Forskalia Kolliker 270 



sp 271 



Erenna Bedot 271 



richardi Bedot 271 



Agalmidae 272 



Agalma Eschscholtz 274 



haeckeli, nom. nov 277 



okeni Eschscholtz 277 



elegans (Sars) 2S1 



Stoph.anomia Peron and I.esueur . . 283 

 bijuga (Delle Chiaje) . . 284 

 amphitridis Peron and 



Le.sue\u- 2,s7 



Nectaliinae 2S9 



Nect alia Haeokcl 290 



