322 HISTORY OF BRITISH CRUSTACEA. 



LjEMArgus mqricatus, 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 (Ortkagorisctis 



Tribe 2. PACHYCEPHALA. 



Head generally much smaller than in the preceding, and 

 generally rather thick, and blunt. Antennas much longer, 

 and of five and six or even more joints ; basal joints of feet 

 detached from each other. 



Pam. ANTROSOMAB^, 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 



