ISOPODS OF NORTH AMERICA. 



427 



Segments of the thorax with the lateral margins of the first segment 

 slightly emarginate anteriorly, the emargination being tilled by the 



FIG. 482. ASELH'8 ATTENT ATI'S. 



Fli,. 4S3.ASKLLVS 

 ATTKNUATUS. LEG 

 OF THE FIRST PAIR 

 OF FEMALE. 



epimeron; second, third, and fourth segments with the margins entire, 

 the epimera evident at the extreme anterior angles; the fifth segment 

 with the posterior two-thirds emarginate, the epi- 

 meron conspicuous in the 

 emargination ; the sixth and 

 seventh segments posteri- 

 orly emarginate, with prom- 

 inent epimera. 



Terminal segment of the 

 body about as broad as 

 long, with a small rounded 

 lobe in the middle of the posterior margin. 



AVhat longer than the terminal segment, extremely slender and cylin- 

 drical in shape, with both branches nearly equal in length, and longer 

 than the peduncle. The first pleopoda in the female are attached close 

 together. 



FIG. 484. ASELLUS ATTENUATUS. 

 a, MAXILLIPED. l>, MANDIBLE. 



The uropoda are some- 



