CONTENTS. 



PAGE 



Report of the Natural History Society for 1911-12 ... ... ... 255 



Report of the Natural History Society for 1912-13 ... ... 2S0 



Megalichthys : A Study incorporating the Results of Work on 

 previously undescribed Material. By theJRev. S. Graham 

 Bikks, M.Sc (Victoria University of Manchester.) Plates 

 XII, XIII, XIV, XV, and XVI.) 307 



Two Newly-discovered Whin Dykes on the Coast of Northumber- 

 land. By J. A. Smythe, Ph.D., D.Sc, Armstrong College, 

 Newcastle-on-Tyne (illustrated)... ... ... ... ... 330 



Report on the Field Meetings of the Natural History Society for 



191 1. By Richard S. Bagnall, F.E.S., F.L.S. ... 344 



Report on the Field Meetings of the Natural History Society for 



1912. By the Rev. J. M. Hicks, MA 366 



Terrestrial Acari of the Tyne Province. By the Rev. J. E. Hull, 



M.A. (Plate XVII.) ... ... 381 



Index to Vol IV 410 



Title Page and Table of Contents for Vol. IV. 



The volumes of the present and preceding series ot Transactions may 

 be obtained through the publishers, or direct from the Hon. Secretaries, 

 Hancock Museum, Barras Bridge, Newcastle-on-Tyne. 



Where brevity is desired in directing exchanges, etc., the following 

 is a sufficient address : 



Natural History Society. 



Newcastle-on-Tyne, 



England. 



PRINTED BY J. BULL AND CO., RAILWAY LANE, PILGRIM STREET, N BWCASTLK-ON-TYNE, 



