iv CONTENTS. 



Proceedings, etc. 



PAGE 



Proceedings from March 22nd to June 28th, 1910, inclusive . . 125 



Gossip Night 137 



Excureious, 1910 139 



Obituarj' Notice Mr. Walter Wesche 145 



PART No. 68, APRIL 1911. 



Papers. 



T. B. ROSSETER. F.R.M.S. Hymenolejjis ujjsilon, A New Species of 



Avian Tape-worm (Plate 6) ....... 147 



Charles F. Rousselet, F.R.M.S. On Three New Species of 



Rotifera (Plate 7) . . . 161 



E. A. MiNCHiN, M.A., V.-P.Z.S., F.L.S. President's Address : Some 



Problems of Evolution in the Simplest Forms of Life . . 165 



James Murray, F.R.S.E., F.Z.S. Water-bears, or Tardigrada 



(Plate 8). (Supplementary Notes) . . . . . .181 



A. A. C. Eliot Merlin, F.R.M.S. On Some New Diatomic Struc- 

 ture discovered with a New Zeiss Apochromat .... 199 



Edward M, Nelson, F.R.M.S, On Dark-ground Illumination . 203 



Notes. 



James Burton. Note on Botrydiuvi granulatum (L.) Grev. . . 209 

 R. T. Lewis, F.R.M.S. Note on the Larva of Mantispa . . . 213 

 Edward M. Nelson, F.R.M.S. A Note on the Amician Test . . 217 



Proceedings, etc. 



Proceedings from October 25th, 1910, to February 28th, 1911, inclusive 219 



Gossip Night, Objects Exhibited and Notes 233 



Forty-fifth Annual Report, 1910 236 



Treasurer's Report, 1910 240 



Obituary Notice Mr. W. M. Bywater 241 



PART No. 69, NOVEMBER 1911. ' 



Papers. 



D. J. Scourfield, F.Z.S., F.R.M.S. The Use of the Centrifuge in 



Pond-life Work (fig. in text) 243 



Charles D. Soar, F.L.S., F.R.M.S. The Work of the late Saville- 



Kent on British Hydrachnids 251 



W. Saville-Kent, F.Z.S., F.L.S., the late. Contributions to a 



Knowledge of the Hydrachnidae 261 



