CONTENTS 
(All rights reserved) 
S Warburton, Cecil. On four new Species and two new Varieties 
of the Ixodid Genus Haemaphysalis. (With 8 Text-figures) 
PAGE 
121 
/ Nuttall, G. H. F. Notes on Ticks. III. On four new Species 
of Ixodes. (With 4 Text-figures) ..... 131 
/ Nuttall, George H. F. Parthenogenesis in Ticks. (Prelimi¬ 
nary note) .......... 139 
Nicoll, William. Recent Progress in our Knowledge of Para¬ 
sitic Worms. A Paper read at the British Association for the 
Advancement of Science. Annual Meeting 1912, Section D. 
—Zoology .......... 141 
Bishopp, F. C. and Wood, H. P. The Biology of some North 
American Ticks of the Genus Dermacentor. (With Plates X 
to XII, and 1 Map) . . . . . . . .153 
Nicoll, William. Trematode Parasites from Food-Fishes of the 
North Sea. (With Plate XIII) ...... 188 
^ Nuttall, George H. F. Rhipicephalus appendiculatus : Varia¬ 
tion in Size and Structure due to Nutrition. (With 4 Text- 
figures) .......... 195 
z Cunliffe, Norman. The Variability of Rhipicephalus pulchellus 
(Gerstacker, 1873), together with its Geographical Distribu¬ 
tion. (With 6 Text-figures) ...... 204 
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