/1 * V f • 
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Vol. 13 
i 
No. 4 
November, 1921 
01 ty&O/s / 
OfC;,, "*%r 
PARASITOLOGX* 
EDITED BY 
GEORGE H. F. NUTTALL, M.D., Ph.D., Sc.D., F.R.S. 
Quick Professor of Biology in the University of Cambridge 
CAMBRIDGE UNIVERSITY PRESS 
C. F. CLAY, Manager 
LONDON: FETTER LANE, E.C. 4 
ALSO 
H. K. LEWIS AND CO., LTD., 136, GOWER STREET, LONDON, W.C. 1 
WHELDON AND WESLEY, LTD., 28, ESSEX STREET, STRAND, LONDON, W.C. 2 
CHICAGO: THE UNIVERSITY OF CHICAGO PRESS 
(AGENT FOR THE UNITED STATES AND CANADA) 
BOMBAY, CALCUTTA, MADRAS : MACMILLAN & CO., LTD. 
TOKYO : THE MARUZEN-KABUSHIKI-KAISHA 
Fifteen Shillings net 
[Issued 24 November^ 1921] 
