ISOPODS OF NORTH AMERICA. 



279 



The first segment of the abdomen has three suture lines, and its pos- 

 terior margin is produced in two small points. 

 one on each side of the median line, about 

 equidistant from it and the lateral margin of 

 the segment. The terminal segment is widely 

 rounded posteriorly. The inner branch oithe 

 uropoda is of nearty equal width throughout 

 its length and is rounded at its extremity; the 

 outer branch is slender and sharply pointed. 

 Both branches are of nearly equal length and 

 neither extends beyond the tip of the abdo- 

 men. 



The first pair of legs have the propodus 

 dilated and the dactylus reflexible. The pro- 

 podus is large and oval in shape. In the legs 

 of the second pair the propodus is irregular in 

 shape, dilated with reflexible dactylus in the 

 male, and simple in the female. The legs of the other five pairs are 

 similar in structure, ambulatory, and show a gradual increase in 

 length. 



FIG. 290. TECTICEPSCONVEXUS. 

 a, HEAD, x 5J. 6, ABDOMEN 



AND LAST THORACIC SEGMENT. 

 X 2|. 



FIG. 291. TECTICEPS CONVEXUS. a, MAXILLIPED. x 27j. b, SECOND LEG OF FEMALE, x 27$. e, FIRST 

 LEG. x 15}. d, MANDIBLE, x 15$. e, SECOND MAXILLA, x 27}. /, FIRST MAXILLA, x 27}. 



