Vll 



LIST OF ILLUSTRATIONS. 



PLATES. 



Portrait of the late Prof. E. A. Minchin. M.A., F.R.S., Facing page 501 



1-3. Foraminiferal Limestones. 



4. Rhabdocoelida. 



5. Asplanchna Silvestrii Daday. 



6. Rotifera. 



7. Spicules of Tetraxonid Sponges. 



8, 9. New Species of Bdelloid Rotifera. 



10. Foraminifera from the North Sea. 



11. Cornuspira diffusa Heron- Allen and Earland. Sand Grains, 



etc., from the Bottom Deposits. 



12. <$ Arrhenurus Scour fieldi sp. nov. 



13. q Acercus longitarsus sp. nov. 



14. Structure of Pleurosigma bait ten m. 



15-18. Lagenae of the South-West Pacific Ocean. 



19. Gastrotricha. 



20. View of Back Lens of Objective with P. angulatum in focus. 

 21, 22. Resolution with Annular Illumination. 



23. Structure of Diatoms. 

 24, 25. Moraria arboricola sp. nov. 

 26-32. Anatomy of the Rat Flea. 

 33, 34. The Genus Lebertia. 

 35-37. Examination of Minerals. 

 38, 39. Xew Species of Habrotrocha. 



40. Rhizopoda. 



FIGURES IN THE TEXT. 



Page 98. Side-screw fine adjustment. 

 ,, 99. Upper and lower membranes in P. strigusum and P. balti- 



cum. 

 277. A changer for sub-stage condensers. 



,, 280. A trap for free- swimming organisms. 



,, 281. An improved form of Cheshire's Apertometer. 



,, 285. Two simple apertometers for dry lenses. 



