CONTENTS. vii 



NUMBER JMGK 



XX. A Demonstration of Lagrange s Rule for the Solution of a Linear 

 Partial Differential Equation, with some Historical Remarks on 

 Defective Demonstrations hitherto Current. By G. Chrystal, Pro- 

 fessor of Mathematics, University of Edinburgh, . . . 551 



XXI. On the Anatomy of Ocneroclrilus (Eisen). By Frank E. Beddard, 

 M.A., Prosector of the Zoological Society of London, Lecturer on 

 Biology at Guy's Hospital. (With a Plate), . . . 563 



PART III. (1890-91.) 



XXII. The Maltese Fossil Echinoidea, and their Evidence on the Correlation 

 of the Maltese Rocks. By J. W. Gregory, B.Sc, F.G.S., F.Z.S., 

 of the British Museum (Nat. Hist.). Communicated by John 

 Murray, LL.D. (With Two Plates), .... 585 



XXIII. The Clyde Sea Area, By Hugh Robert Mill, D.Sc, F.R.S.E. 



(With Twelve Plates and Maps), . . . . .641 



Appendix— 



The Council of the Society, ...... 734 



Alphabetical List of the Ordinary Fellows, . . . 735 



List of Honorary Fellows, ...... 750 



List of Honorary Felloivs Elected during Session 1889-90, . . 752 



List of Fellows Deceased, Resigned, or Cancelled during Session 1889-90, 753 



List of Ordinary Fellows Elected daring Session 1890-91, . . 754 



List of Honorary Fellows Deceased, Resigned, or Cancelled during 



1890-91, ........ 755 



Laws of the Society, ....... 757 



