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HISTORY OF BRITISH CRUSTACEA. 
L^emargus muricatus, Kroyer. (Plate XIX. fig. 4.) — 
Plate-like appendage and the last thoracic segment finely 
toothed round the lower margin, and both deeply notched. 
This species has been found, like the last, on the sun- 
fish ( Orthagoriscus mola). 
Tribe 2. PACHYCEPHALA. 
Plead generally much smaller than in the preceding, and 
generally rather thick, and blunt. Antennse much longer, 
and of five and six or even more joints ; basal joints of feet 
detached from each other. 
Eam. ANTHOSOMADjE, Baird . 
Head of considerable size ; near the mouth there is a pair 
of large foot-jaws, armed with strong hooks. Thorax fur- 
nished with plate-like appendages. There are three pairs of 
foliaceous feet. 
Gen. 180 . ANTHOSOMA, Leach. 
Dr. Baird remarks on this genus, that “ from the form of 
the feet and the large development and prehensile structure 
of the foot-jaws, it is evident that the animals are incapable 
