ISOPODS OF NORTH AMERICA. 



129 



"Second antenna? long and slender, when placed close to sides of 

 body reaching to about anterior margin of telson; peduncle four 

 jointed, joints increasing gradually in length and slenderness, second 

 joint furnished on distal external angle with four or five setae; 

 flagellum with about eighteen joints, which are longest in its middle. 



"Epistome slender, expanded in front and emarginate, reaching to 

 about the level of frontal margin of head, but not connected with it. 



"Mandible with tridentate cutting edge, movable pectinate ap- 

 pendage and three -jointed palp, in general resembling this organ 

 in Eurydice. 



FIG. 110. BRANCHfRorrs UTTORAUS (AFTER MOORE), o, FRONT OF HEAD FROM BELOW, b, FIRST 



ANTENNA. C, SECOND ANTENNA, d, GENERAL FIGURE. , MANDIBLE. /, FOURTH LEG. fif, MAXIL- 



LIPED. h, FIRST LEG. (', SEVENTH LEG. 



"Maxillipeds two jointed, the basal joint long, somewhat trans- 

 versely of the head; the second joint short and armed with a few 

 hairs distalty. 



"Thoracic limbs gradually increasing in length posteriorly. First 

 limb with second joint longest, the third, fourth, and fifth successively 

 shorter, the sixth joint as long as third, and pectinate by a series of 

 spines, the last one stoutest, and the seventh not forming with the 

 sixth a subchelate hand, as in Anuropus. 



"The posterior border of the limb is furnished with spines and 

 setae. Second and third pairs subsimilar with the fifth joint larger. 

 Fourth to seventh pairs backwardly directed, and becoming success- 

 ively broader and flatter, resembling the posterior limbs of Eurydice, 

 2858905 9 



