A TU11AL HISTOR Y. 



Praya diphyes Vtlclla limbosa .... 284 

 Diagrammatic Section of Hydra Nematocyst of 



Hydra viridis 285 



Hydra viridis Perigonimus vestitus . . . 286 

 Lizzii Floating Beneath the Surface Euden Irium 



insigno . . . . . . . .287 



Podocotync camca , ...... 288 



The Straw Tubtilaria 289 



Plumularia halccoides Medusa of a Hydroid . 290 

 Margin of a Medusoid Eucope diaphana . .291 

 Cannarina (Gcryonia) hastata .... 292 



Millepora 293 



Caryophyllia cyathus 297 



Favia pallid* . 298 



Diploria cerebriformis ...... 299 



Dcndrophyllia ramea 300 



Madrepora plantaginca 301 



Antipathes arborea Vertical Section of Sea Ane- 

 mone ........ 302 



Sea Anemones .... To face page 303 



Thread-cells of Sea Anemone Actinia mcsembry- 



anthemum . 303 



Edwardsia callimorpha ...... 304 



Pennatula (Pteroeidcs) spinosa .... 305 



Umbellularia groenlandica ..... 306 



Corallium rubrum Corallium spicule . . . 307 

 Enlarged Section of Stem of Corallium rubrum . 308 

 The Sea Fan Tubipora musica .... 309 



Tubipora musica . 310 



Section of Turkey Bath Sponge . . . .313 

 Poriferous Surface of a Sponge . . . .314 

 Fac-simile of .Grant's First Figure Flagellated 



Chambers of Turkey Bath Sponge . . .315 

 Flagellate Collared Infusorian Feeding Ectoderm, 

 and different Forms of Endodermic Cells from 

 Scycandra raphanus . . . . .316 

 Spermatozoa . . . . . . . .317 



Ascetta piamordialis 318 



Sponges To fnce pnge 319 



Euplectella suberea ; Hyalonema Sieboldii ; Po- 

 terion; Siphonia pyriformis; Dactylocalyx 



Stuchburyi 319 



Various Forms of Sponge Spicules . . . .321 

 Various Smaller Forms of Sponge Spicules . . 322 

 Development of a Silicious Sponge .... 323 

 Development of a Calcareous Sponge . . . 324 



Statoblasts of Spongilla 327 



Section through the Rind of a Geodine Sponge 



Section through the Wall of Euplectella . . 329 

 Separate Spicules of a Lyssakine Sponge ; Spicular 

 Network of a Dictyonina: Dictyoiiine Network 



with Octahedral Knots 330 



Amoeba protcus . . . . . . o33 



Protamoeba primitiva 



Amu-ba protcus ....',.. 



Mastigamoeba aspcrsa ...... 



Actinoplirys sol ....... 



Clathriilma elegans 



Acanthometra echinoidcs . 



Xiphacantha Murrayana Radiolxrian Skeletons . 



Eucecryphalus Schultzei Groinia terricola 



Miliola Discorbina ...... 



Various Forms of Foraminifera . . . . 



Foraminiferal Shells Foraminifcral Shell", figured 

 with the Aperture downwards 



Foraminiferal Shells Section of the Shell of Kotalia 

 Schru'teriana ....... 



Infusoria in the Field of the Microscope 



Paramecium aurelia ...... 



Cerconi''nas typica . 



Genera of Cilio-flagellate Infusoria 



Acineta tuberosa ....... 



Dendrosoma radians Tintinnus lagenula 



Stylonychia mytilus ; Euroleptus Lembus vclifer 



Prorodon margaritifer ; Pharyngeal Rod-fascicle of 

 P. niveus; ditto of Nassula Diagram of Vor- 

 ticella nebulifera; Phases of Longitudinal 

 Fission ; Phases of Attachment ; Phases of In- 

 corporation of Free Embryo of V. microstoma; 

 Encysted Stage of V. marii.a . . . . 



Condylosoma patens ...... 



Coleps hirtus 



Ichthyophthirius multifiliis ..... 



Ophryodendron pedicellatum on a I'lumularia Stem; 

 O. multicapitatum ...... 



Enchelys farcimen Tra< heloccrca olor . 



Trichonomorpha agilis Opalina ranarum Anoplo- 

 phrya prolifera 



Bursaria truncatella Spirostomum ambiguum 

 Stentor polymorphus ..... 



Folliculina ampulla Halteria grandinella 



Urocentrum turbo ; Transverse Fission Vorticella 

 nebulifera ....... 



Zoothamnium niveum ; Single Animalcule; Episty- 

 lis umbilicata ; Branchlet of Carchesium poly- 

 pinum; An Epistylis growing on a Cyclops 

 Ophrydium eichhorni Pyxicola pyxidi- 

 formis ........ 



Chlamydodon mnemosyne Dysteria arm;ita 

 Strihotricha remex Euplotes charon 



Monas Dallingeri ....... 



Cladoncmalaxa; Animalcule Dividing ; Anthophysa 

 vegetans; Sporocyst Liberating Germs Khi- 

 pidodondron splendidum. . 



Collared Monads .... To face page 



Noctiluca miliaris ....... 



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