ISOPODS OF NOKTH AMEKICA. 



899 



and firmly 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. 



Eusymmerus antennatus 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. 445. EUSYMMEKUS ANTENNATUS. X 8. 



FIG. 446. EUSYMMEKUS 

 ANTENNATUS. MAX- 

 ILLIPED. X 27J. 



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

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

 antennae. Second pair of antennae consist of six articles, and are 

 geniculate, the last or flagellar joint being somewhat clavate. 



Thoracic segments with the 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 articulating with segments. 



Abdomen composed of only one segment with suture lines indicative of 

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

 from the base to the extremity. 



