ISOPODS OF NORTH AMERICA. 



129 



"Second anteiina' long- and .slender, when placed closo to sides of 

 body reaching- to al)ont anterior margin of telson; peduncle four 

 jointed, joints incrc^asing gradually in length and slenderness, second 

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

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



"Epistome slcMider. exi)anded in front and emarginate, reacliing to 

 about the le\-el of frontal margin of head, ])ut not connected with it. 



"Mandible with tridentate cutting edge, movable pectinate ap- 

 pendage and three-jointed i)al]). in general resembling this organ 

 in Eurydlcc. 



Fig. lUi. — BRANCHrRopis littoralis (After Moore), n, Fro.nt of head fro.m below. /<, First 

 ANTENKA. c, Second ante.nna. d, (Jeneral figire. e, Mandible. ./", Foirth leg. (j, Maxil- 

 LiPED. /(, 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 distally. 



"Thoracic limbs graduall}- 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 l)order of the limb is furnished with spines and 

 seta'. 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 liml)s of Eurydtce^ 

 28589—05 9 



