274 



Miss H. Richardson on the Isopods of the 



Thoracic segments with lateral margins expanded. Lateral 

 edges straight, full. Epimera of second, third^ fourth, and 

 fifth segments coalesced and firmly united with the segments ; 

 epimera of sixth and seventh segments distinct and articu- 

 lating with segments. 



Fig. 20. 



Fip.27. 



Fig. 26. — Eusymmei-vs antennatus. y 8. 



Fig. 27, — Maxilliped of Eusymmet-ns antennatus. 



Ahdomcn of only one segment, with suture-lines indicative 

 of another partly coalesced segment. Abdomen posteriorly 

 rounded, tapering from the base to the extremity. 



Legs slender, with dactyli biunguiculate. 



Colour of specimen brown. Lateral edges of thoracic seg- 

 ments colourless. 



One individual from off Abreojos Point, Lower California, 

 Station 2835, was collected by the U.S. Fish Commission 

 steamer ' Albatross ' ; depth 48 fathoms. 



Tf/pe. No. 22580, U.S. N. M. 



Family X. Arcturidae. 

 23. Arcturus, Latreille. 

 Flagellum of second pair of antennte more than four-jointed. 



