PROCEEDINGS 



ROYAL PHYSICAL SOCIETY 



PROMOTION OF ZOOLOGY AND OTHER BRANCHES OF 

 NATURAL HISTORY. \£^3» \ 



SESSION 1911-1912. 



No. 4. 



VOL. XVIII. 



Pages 219-276, 



CONTENTS 



XXIII. Some Northern Hydroid Zoophytes obtained by Hull Trawlers ; 



with Description of a new species of Plumularian. By 

 James Ritchie, M.A., B.Sc, Royal Scottish Museum 



XXIV. Note upon a Tachinid Parasite (Bucentes geniculatus, D. G.) 



of Tipula sp. By John Rennie, D.Sc. 



XXV. An Aid in the Study of Nematocysts. By T. H. Taylor, M.A., 

 Zoology Department, University of Leeds 



XXVI. Note on Pelagic Organisms and Evolution. By J. Graham Kerr 



XXVII. "Scotia" Collections — Further Note on Microscopic Life on 

 Gough Island, South Atlantic Ocean — Rhizopoda. By 

 Dr Eugene Penard, Geneva. (Communicated by William 

 Evans, F.R.S.E.) ...... 



XXVIII. On Docophorus bassdncs, Denny, and Lipeurus staphylinoides, 

 Denny. By James Waterston, B.D., B.Sc. 



XIX. Description of a New Species of Hydracarina — Piersigia 

 intermedia. By Wm. Williamson, F.R.S.E. 



XX. Note on Arctic Palaeozoic Fossils from the "Hecla" and 

 "Fury" Collections. By G. W. Lee, D.Sc. 



XI. Note on Mallophaga from the Little Auk or Rotchie {Alle alle) ; 

 with List of Species taken on Birds and Mammals in the 

 Forth Area. Bv William Evans, F.R.S.E. 



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265 



EDINBURGH: M'FARLANE k ERSKINE, 



October 1912. ^fl? 



^Sgonal M' 



