EXPLANATION OF THE PLATES. XUl 



Plate Page 



fMAP OF Olipperton Atoll ; View of E.ock ibid., looking 

 NORTH-WEST ; and near view of the same, to illustrate 

 Adm. Sir W. J. Wharton's paper on that atoll 228 



f Microscope - sections of Phosphatized Trachyte from 

 Clmterton Atoll, to illustrate Mr. J. J. H. Teall's paper 

 on that rock 230 



XXTV fHoLASTER ALTUS, Ag., to illustrate Mr. A. J. Jukes-Browne's 



■ [ note on that fossil 246 



Yyrr_ f -^^^^^'^*^^^^^^ FROM Gotland; and Petalocrinus from 

 -j^yy-T \ North America, to illustrate Mr. F. A. Bather's paper on 



I that genus 401 



Trochooraptus diffusus (Holm), to illustrate Miss G. L. 

 XXVII. -{ Elles's paper on the Graptolite -Fauna of the Skiddaw 



Slates 463 



f Sketch-map of High-level Gravels in the Reading 

 District, to illustrate Mr. O. A. Shrubsole's paper on those 

 ^ deposits 585 



"YXTT /Ju'^ASsic FOSSILS from Franz Josef Land, to illustrate 

 AAiA. I j^j. -g_ rjy j^g^ton's notes on the same 648 



Tables ^ ' '^^^^^^^^ ' time-divisions ; and Ammonite-Genealogy, to 

 I & II 1 illi^strate Mr. S. S. Buckman's paper on the Grouping 



1 of some Divisions of so-called ' Jurassic ' Time 442 



