Yol. XX.—Part I.f ^®'\bclPl921—MARCH 1922. 
The 
Essex Naturalist: 
BEING THE JOURNAL OF THE 
ESSEX FIELD CLUB. 
Edited by PERCY THOMPSON, F.L.S., Honorary Secretary, 
assisted by 
HENRY WHITEHCAD, B.Sc. 
Con ten pack 
The British Freshwater Planarians (Tricladida) By Henry 
Whitehead, B.Sc. (with one Plate) .. •• .. .. .. i 
The Sparrow-hawk and the Goshawk in Litigation infthe 12th and 
13th centuries. By William E. Glegg, F.Z.S., M.B.O.U. .. 21 
Notes on the Occurrence of the British Trap door Spider in Epping 
Forest. By Hugh Main, B.Sc., F.E.S. (with one Plate) .. .. 23 
The Birds of the Crouch Valley in 1921. By William E. Glegg, 
F.Z.S., M.B.O.U.25 
The Rosy-marbled Moth in Britain. By Charles Nicholson, F.E.S. 29 
Essex Field Club: Reports of Meetings, 23rd April 1921 to 15th 
O ctober 1921 .. .. •• •• «. •• .. •• •• 31 
Jabez Legg : a Forgotten Local Worthy. By John Avery, F.C.A., 
F.S.S. (with one Plate).. .. .. .. .. .. .. •• 43 
Original Notes: (with two Illustrations) .. .. .. .. .. 43 
7 he Authors alone are responsible for the Statements and Opinions contained in 
their respective Papers. 
STRATFORD, ESSEX : 
PUBLISHED BY THE CLUB, AT THE ESSEX MUSEUM OF 
NATURAL HISTORY. 
Fdi orial communications to Pk.rcv Thompson, Essex Museum, Romford Road 
Stratford, and Advertisements to Messrs. Bk.nham and Companv, Limited, 
Printers, Colchester. 
Published March 1922.] 
Price, to Non Members, 6/6. 
