JOURNAL 



OP THE 



EOYAL MICROSCOPICAL SOCIETY. 



VOL. II. No. 3. 



CONTENTS. 



Tkansaotions of the Society — ^^^^ 

 XII. A Contribution to the Knowledge of British Ori- 

 BATIDJ5. By A. D. Michael, F.E.M.S., with the assist- 

 ance of C. F. George, M.R.C.S.E. (of Kirton Lindsey) 



(Plates IX.-XI.) .. 225 



XIII. Notes on the Pygidia and Cerci of Insects. By 



Henry Davis, P.E.M.S. 252 



XIV. On Stephenson's System of Homogeneous Immersion 



FOR Microscope Objectives. By Professor E. Abbe, 



of Jena, Hon.F.K.M.S ., 256 



XV. The Vertical Illuminator and Homogeneous-Immersion 



Objectives. By J. W. Stephenson, F.R.A.S., Treas. 



E.M.S 266 



XVI. Note on Diagrams (Plate XII.) exhibiting the Path 



OF a Eay through Tolles' ^ Immersion Objective. 



By Professor R. Keith .. .. .. .. .. 269 



XVII. Note on Mr. Wenham's Paper " On the Measurement 



OF THE Angle of Aperture of Objectives." By 



Professor E. Keith ,. .. .. .. .. 270 



XVIII. Eeply to THE foregoing Note. By F. H. Wenham, 



F.E.M.S. 271 



Notes and Memoranda .. ,. ,, .. .. ,. 272 



Nuclei of the Blood-corpuscles of the Triton 272 



Division of Curtilage Cells 273 



Infitience of the different Colours of the Spectrum on Animals 273 



Formation, Fructification, and Division of the Animal Ovum 274 



Digestion of Albuminoids by Tnvertebrata 274 



Eozoon Canadense 275 



Beticularian Bhizopoda 276 



Protozoa of Northern Bussia 276 



Deep-sea Siphonophora 278 



Strange Anomcdy among the HydromedussB 278 



Muscle-epithelium in Anthozoa 279 



Phyloge7iy of the Antipatharia 279 



Skeleton of the Alcyonaria , 279 



New Species of Isis 281 



G or gonia verrucosa 281 



Prehensive Cells in the Ctenophora 282 



Australian Corals 282 



New Genus of Milleporidse 283 



New Genus of Starfishes 283 



Helminthology 283 



Excretory Apparatus of Solenophorus megalocephalus 284 



Anatomy and Embryogeny of tJie Tseniadx 285 



Parasites of the Lamellibranchiata 285 



New Turbellarian 286 



Digestive Organs of the Fresh-water Turhellarians 287 



Land Planarians , 288 



Marine Planarians 288 



Organization and Development of the Oxyurtds 289 



Researches on Bonellia viridis 290 



Development of Chxtopoda 291 



