ISOPODS OF NOETH AMERICA. 



899 



and (irml}^ united with the segments; those of the sixth and seventh 

 segments distinct and visible. 



Abdomen composed of one segment with suture lines indicative of 

 another partly coalesced segment. 



EUSYMMERUS ANTENNATUS Richardson. 



I'Jii.v/mmeruK antennalus Richardson, Proc. U. S. Nat. Mus., XXI, 1899, pp. 852- 

 853; Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 273-274. 



Locality. — Abreojos Point, Lower California, 



Depth. — 5i fathoms. 



Body elliptical, tapering toward the extremity; surface smooth. 



Head three times broader than long, with the antero-lateral angles 



prominent. Anterior mar- 

 gin excavate. Lateral mar- 

 gins expanded. Eyes situ- 

 ated dorsally on the extreme 

 lateral margin in the median 



Fig. M!).— EUSYMMERI'S ANTENN.\Tr.S 



Fig. 446. — EUSYMMERUS 

 ANTENNATUS. MAX- 

 ILLIPED. X 27}. 



transverse line. First pair of antennae composed of four articles, short, 

 extending only a little beyond the second joint of the second pair of 

 antennie. Second pair of antennte consist of six articles, and are 

 geniculate, the last or flagellar joint being somewhat clav^ate. 



Thoracic segments with the latei-al margins expanded. Lateral edges 

 straight, full. Epimera of second, third, fourth, and fifth segments 

 coalesced and tirinly united with the segments; epimera of sixth and 

 seventh segments distinct and articulating with segments. 



Abdomen composed of onl}^ one segment with suture lines indicative of 

 another partly coalesced segment. It is posteriorly rounded, and tapers 

 from the base to the extremity. 



