124 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Porina coronata and Lepralia sijringopora both have a closure, 

 formed by a plate with a tubule in the centre, a structure supposed 

 to be exclusivel}' characteristic of the Cyclostomata. 



The position of the beds has been established by Suess, Bayan, 

 Hebert, and Munier-Chalmas as of Bartonian age, and may therefore 

 be called Upper Eocene. 



3. " Notes on the Discovery, Mode of Occurrence, and Distribution 

 of the Nickel-Iron Alloy ' Awaruite ' and the Eocks of the District 

 on the West Coast of the South Island of ISTew Zealand in which it 

 is found." By Professor G. H. F. Ulrich, F.G.S. 



The following specimens were exhibited : — 



Specimens exhibited by A. W. Waters, Esq., E.G.S., in illustra- 

 tion of his paper. 



Specimens exhibited by Prof. J. W. Judd, F.E.S., F.G.S., for 

 Prof. G. H. F. Ulrich, F.G.S. , in illustration of his paper. 



June 18, 1890. 

 Dr. A. Geikie, F.B.S., President, in the Chair. 



Thomas David WiUiams, Esq., West Kirby, Cheshire, was elected 

 a Fellow of the Society. 



The List of Donations to the Library was read. 



The following communications were read : — 



1. " The Borrowdale Plumbago, its Mode of Occurrence and pro- 

 bable Origin." By J. Postlethwaite, Esq., F.G.S. 



[Abstract.] 



After giving details of the mode of occurrence of the plumbago 

 (graphite) of Borrowdale in veins traversing diabase and diorite, 

 which break through the Volcanic Series of Borrowdale, and in 

 " sops " or pipes, of various sizes, at a little distance from the veins, 

 the Author refers to the modes of occurrence of graphite in other 

 regions, and contrasts these with the surroundings of the graphite 

 in the Lake District. He points out that many thousand feet of 

 volcanic rock supervened between the Borrowdale plumbago-bearing 



