NATURALIST: 
MONTHLY JOURNAL OF 
NATURAL HISTORY FOR THE NORTH OF ENGLAND 
EDITED BY 
PHOS SHEPPARD. M-Sc:, F.Gis., EF RUG:S.,. PeSsAe(Scor,): 
CURATOR OF THE MunicipAL Museums, HULL. 
AuTHOR OF ‘GEOLOGICAL RAMBLES IN East YORKSHIRE’; ‘THE EVOLUTION 
ov Krxcston uron Hut’; ‘Lost Towns oF THE YORKSHIRE CoaAST,’ ETC., ETC 
Epiror oF Mortimer’s ‘ Forty YEARS’ RESEARCHES,’ 
THOMAS WILLIAM WOODHEAD, Ph.D., M.Sc., F.L.5. 
LECTURER IN BioLtoGcy, TECHNICAL COLLEGE, HUDDERSFIELD ; 
WITH THE ASSISTANCE AS REFEREES IN SPECIAL DEPARTMENTS OF 
J. GILBERT BAKER, F.R.S., F.L.S. f GEORGE T 
Pror. PERCY F. KENDALL, M.Sc., F.G-S. JOHN W. TAYLOR, M.Sc. 
RILEY FORTUNE, F.Z.S. 
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ee, 
qaitnsenian Oy, 
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JUN 24 1920 
A464 t, 
one: 

LONDON : 
A. Brown & Sons, LTp., 5, FARRINGDON AVENUE, E.C., 
AND AT HULL AND YORK. 
Tr. PORRITT, F.L,S., FES. * 
“SD 
