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Dbcembek 31, 1923. Pnce 6.< 
THE JOURNAL 
OF 
THE LINNEAN SOCIETY. 
Vol. XXXV. ZOOLOGY. No. 236. 
CONTENTS. 
Page 
I. A Form of Diinorphistu and Asexual Reproduction in Ptycliodera 
capenxis (Hemichordata). By .J. D. F. Gilchrist, M.A., D.Sc, 
F.L.S., Professor of Zoology in the University of Cape Town. 
(With 7 Text-figures.) .' 393 
II. On the Morphology of the Head Capsule and Mouth-parts of 
CIdorops tceniopus Meig. (Diptera). By J. G. H. Frew, M.Sc, 
Ministry of Agriculture Research Scholar. (From the Ento- 
mological Department, Rothamsted Experimental Station, 
Harpenden.) (Communicated by Dr. A. D. ImmS;, F.L.S.) 
(With 7 Text-figures.) 399 
III. The Crustacean Plankton of the English Lake District. By 
Robert Gurney, M.A., F.L.S. (Plate 23 and 3 Text- 
figures.) 411 
LONDON: 
SOLD AT THE SOCIETY'S APAllTMENTS, BURUNGTON HOUSE, 
PICCADILLY, W.l, 
AND BY 
LONGMANS, GREEN, AND CO., 
AND 
WILLIAMS AND NORGA- 
1923. /^ 
L JAN 2 31924 
