W. H. Leigii-Sharpe 
273 
thorax alone shows traces of segmentation. The abdominal appendages 
are large, and three-sevenths the length of the trunk. The mandibles 
differ from those figured of any other species, being much more slender, 
aciculate with minute sharp-pointed downward-pointing teeth, while 
at the base of the blade is a flat triangular plate. The maxillipede is 
especially characteristic, the terminal joint being slender, and the basal 
joint having a peculiar liook-like projection between the cushions of 
spines. Ovisacs usually of the same length as the trunk. 
This investigation was carried out at the South-Western Polytechnic, 
Chelsea, London, S.W. My thanks are due to Mr J. T. Cunningham 
for his kind help and to Mr F. Maurice-Rey for reproducing the figures 
from my sketches. 
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