viii CONTENTS. 



Nl'MHKl! PA0E 



XXI. On a Rule of Proportion observed in the Setse of certain Naididce. 

 By J. Stephenson, M.B., D.Sc, Professor of Zoology, Government 

 College, Lahore, . . . . . • .783 



XX II. On the Sexual Phase in certain of the Naididx. I. The Anatomy of 

 Sexual Individuals of the Genus Dero ; with Remarks on Hwmonais. 

 II. The Genital Organs in the Genus Slavina. By J. Stephenson, 

 D.Sc., Professor of Zoology, Government College, Lahore. (Plate 

 LXXX), . 789 



XXIII. Geological Observations in South Georgia. By D. Ferguson, Mem. 



Inst. M.E., F.R.G.S. Communicated by Professor J. W. Gregory, 

 D.Sc.,F.R.S. (Plates LXXXI-XCI), . . . .797 



XXIV. The Geological Relations and Some Fossils of South Georgia. By 



J. W. Gregory, D.Sc., F.R.S. (Plates XCII-XCIII), . . 817 



XXV. The Petrology of South Georgia. By G. W. Tyrrell, A.R.C.Sc, 

 F.G.S., Lecturer in Mineralogy and Petrology, University of 

 Glasgow. (Plate XCIV), . . . . . .823 



XXVI. The Anatomy and Affinity of Deparia Moorei, Hook. By John 

 M'Lean Thompson, M.A., B.Sc, Glasgow University. Communicated 

 by Professor Bower. (Plates XCV-XCVIi), . . .837 



XXVII. Morphology and Mathematics. By D'Arcy Wentworth Thompson, 857 



XXVIII. The Poisoned Arrows of the Abors and Mishmis of North- East India, 

 and the Composition and Action of their Poisons. By Sir Thomas 

 R. Fraser, M.D., F.R.S., Professor of Materia Medica and Thera- 

 peutics in the University of Edinburgh. (Plates XCVIII-C), . 897 



Index, . x£v^ H < Vu sSx • .931 



