ISOPODS OF NORTH AMERICA. 



FIG. 15. TANAIS ROBUSTUS (AFTER MOORE), a, GENERAL FIGURE. &, SECOND ANTENNA, c, MAN- 

 DIBLE. c 1 , DETAIL OF MANDIBLE, d, ANTERIOR (FIRST) MAXILLA, d 1 , TIP OF FIRST MAXILLA. 

 e, MAXILLIPED. /, FIRST GNATHOPOD OF MALE, g, FIRST GNATHOPOD OF FEMALE, h, FIRST PEREIO- 

 POP. i, LAST PEREIOPOD. j, PLEOPOD. k, UROPOD. 



