ISOPODS OF NORTH AMERICA. 



349 



following, being as wide as the basal article; the fifth article is one 

 and a half times longer than any of the three preceding ones. The 



FIG. 374. MESIDOTEA ENTOMON (AFTER GERST,ECKER). a, DORSAL VIEW, x U. b, MANDIBLE, c, 

 MANDIBLE, d, VENTRAL VIEW, x H. e, LABIUM. /, MAXILLIPEDS. g, HALF OF TWO THORACIC 



SEGMENTS ABOUT THE MIDDLE, WITH ONE LEG. h, ABDOMEN (VENTRAL SIDE). i, CROSS SECTION 

 OF A THORACIC SEGMENT ABOUT THE MIDDLE, j, SECOND MAXILLA, k, FIRST MAXILLA. I, SEC- 

 OND ANTENNA. TO, FIRST ANTENNA. 



flagellum is composed of five articles, the first one being nearly three 

 times as long as any of those following. The maxillipeds have a palp 

 of five articles. 



