ISOPODS OF NORTH AMEEICA. 



113 



subequal and each is about twice as long as the third. The flagellum is 

 composed of thirty-two articles. The second pair of antennse extend 

 to the fourth thoracic segment. The maxilliped is composed of seven 

 articles. The palp of the mandibles is composed of three articles. 

 The frontal lamina is broad and 

 has the anterior margin trian- 

 gularly produced, the apex be- 

 ing rounded and meeting the 

 anterior portion of the median 

 point of the front of the head. 



The first thoracic segment 

 is twice as long as any of the 

 other segments, which are sub- 

 equal. The epimera are dis- 

 tinct on all the segments with 

 the exception of the first. The 

 last four are crossed by an ob- 

 lique carina, the first two by a 

 longitudinal carina. The last 

 four are also broader than the 

 first two and have the outer 

 postlateral angle more acute, 

 it being produced in the last 

 two beyond the posterior mar- 

 gin of the segments. 



The first segment of the ab- 

 domen is entirely concealed 

 by the seventh thoracic seg- 

 ment. The sixth or terminal 

 segment is produced in a 

 rounded extremity, which is 

 crenulate and furnished with 

 eight spines. The inner branch 

 of the uropoda is wide and is 

 produced beyond the extremity 

 of the abdomen; its posterior 

 end is obliquely truncate, and 

 crenulate with the outer post- 

 lateral angle acutely produced 



in two prominent teeth; the outer margin is faintly crenulate; both 

 margins are furnished with spines. The outer branch is half as wide 

 as the inner branch, is somewhat shorter, and is acutely produced in 

 two prominent teeth. The peduncle extends to the inner post-lajteral 

 angle of the inner branch. 

 2858S 



FIG. 95. ClROLANA PAEVA (AFTER MOORE), a, GEN- 

 ERAL FIGURE, x 53. 6, FIRST ANTENNA, x 33. 

 c, SECOND ANTENNA, x 33. 



^~ <;<? 



