Ill 



CONTENTS. 



PART No. 78, APRIL 1916. 

 Papers. 



PAGE 



A. E. Hilton. On the Formation of Sporangia in the Genus 



Stemonitis (Plate 1) . . . . . . .1 



James Burton. On a Species of Aleurodes .... 7 



G. T. Harris. The Collection and Preservation of Desmids . 15 

 Arthur Dendy, D.Sc, F.R.S. Presidental Address — Some 



Factors of Evolution in Sponges . . . . .27 



W. Milne, M.A., B.Sc, F.R.S. E. On the Bdelloid Rotifera of 



South Africa. Part 1. (Plates 2-6) . . . .47 



Notes. 

 J. T. Cook. A Simple Trough for Pond Life (Figs. 1 and 2) . 85 



Proceedings, etc. 



Proceedings from October 26th, 1915, to February 22nd, 1916, 



inclusive ......... 87 



Fiftieth Annual Report, 1915 . ...... 99 



Treasurer's Report, 1915 . . . . . . . 105 



PART No. 79, 'NOVEMBER 1916. 



Papers. 



Chapman Jones. The Secondaries or Dotted Structure in 



Pinnulariae (Plate 7). . . . . . .107 



A. A. C. Eliot Merlin, F.R.M.S. On Nitzschia singalensis as a 



Test-Object for the Highest Powers (Plate 8) . . .111 



M. A. AiNSLiE, R.N., B.A., F.R.A.S. Nitzschia singalensis : A 



Note on Mr. Merlin's Paper . . . . . .113 



H. Wallis Kew. An Historical Account of the Pseudoscorpion- 



famia of the British Islands (Figs. 1 and 2 in text) . .117 



A. E. Hilton. On Sporangial Characters of Mycetozoa and 



Factors which influence them (Plate 9. Figs. 1 and 2 in 



T'OXuj ■ • « • • • • • • • k O i 



W. Milne, M.A., B.Sc, F.R.S.E. On the Bdelloid Rotifera of 



South Africa. Part II. (Plates 10-14) , . .149 



