CONTENTS. 



TRANSACTIONS OF THE SOCIETY. 



PAGE 



I. — Some African Rotifers : Bdelloida of Tropical Africa. By J. Murray, 



F.R.S.E. F.Z.S. (Plates I., II.) 1 



II. — A Simple Method of Obtaining Instantaneous Photomicrographs. By 



J. Edwin Barnard. (Fig. 1) 19 



III. — On the Use of a Metallic Electric Arc in Photomicrography. By 



J. Edwin Barnard 21 



IV. — Aerator Suitable for Laboratory Aquaria. By F. J. Gemmill, M.A. 



D.Sc. M.D. (Fig. 2) . .. .: .. .. 24 



V. — Adaptation of Ordinary Paraffin Baths for Vacuum Embedding. By 



F. J. Gemmill, M.A. D.Sc. M.D. (Fig. 3) 26 



VI. — The President's Address : The Determination of Sex. By J. Arthur 



Thomson, M.A 141 



VII. — On the Measurement of Grayson's New Ten-Band Plate. By A. A. C. 



Eliot Merlin 160 



VIII. — Australian Rotifera : Collected by the Shackleton Antarctic Expedition, 



1909. By J. Murray, F.R.S.E. (Plates IV, V.) 164 



IX. — Anomalies in Objective Screw Threads. By F. W. Watson Baker. 



(Fig. 24) 175 



X. — Adams's " Variable " and the Evolution of the Modern Microscope. By 



Edward M. Nelson (Figs. 25-30) 178 



XI. — Canadian Rotifera : Collected by the Shackleton Antarctic Expedition, 



1909. By J. Murray, F.R.S.E. (Plates VI.-VIII.) 285 



XII. — On the Recent and Fossil Foraminifera of the Shore-sands of Selsey Bill, 

 Sussex. — VII. Supplement (Addenda et Corrigenda). By Edward 

 Heron-Allen, F.L.S. F.R.M.S., and Arthur Earland, F.R.M.S. (Plates 

 IX.-XIII.) 298 



XIII. — Rotifera of some Pacific Islands : Collected by the Shackleton Antarctic 



Expedition, 1909. By James Murray, F.R.S.E. (Plates XIV., XV.) 429 



XIV. — On the Recent and Fossil Foraminifera of the Shore-sands of Selsey Bill, 

 Sussex. — VIII. Tabular List of Species and Localities. By Edward 

 Heron-Allen, F.L.S. F.R.M.S., and Arthur Earland, F.R.M.S 436 



XV. — A Report on the Grayson's Rulings presented by Mr. C. Beck to the 



Royal Microscopical Society. By E. J. Spitta 449 



XVI. — On some New Objectives and Eye-pieces by R. Winkel, of Gottingen. 



By Edward M . Nelson 451 



XVII. — Rotifera of New Zealand : Collected bv the Shackleton Antarctic Ex- 

 pedition, 1907-9. By James Murray, F.R.S.E. (Plates XVI., XVII.) 573 



XVIII. — South African Rotifera: Collected by the Shackleton Antarctic Ex- 

 pedition, 1907. By James Murray, F.R.S.E. (Plate XVI.) .. .. 5S4 



