ISOPODS OF NORTH AMERICA. 



687 



"Body oblong oval; greatest width not attaining half the length. 

 Dorsal face rather convex and perfectly smooth and shining. Cepha- 

 lon of moderate size and evenly rounded in front. Dorsal face trans- 

 versely grooved behind the eyes. Lateral parts of the three anterior 

 segments of mesosome but slightly prominent; those of the four pos- 

 terior segments somewhat larger and terminating behind in obtuse 

 points. Metasome scarcely exceeding in length one-third of the meso- 



FlG. 730. LlGIDIUM HYPNORUM (AFTER SARS). O, MANDIBLE, b, FIRST ANTENNA. C, ANTERIOR 



uv. d, SECOND ANTENNA, e, FIRST ANTENNA. /, FLAGELLUM OP SECOND ANTENNA. </, FIRST MAX- 

 ILLA, ft, SECOND MAXILLA, i, DORSAL VIEW OF FEMALE. .;', MAXILLIPED. k, MANDIBLES. I, POS- 

 TERIOR LIP. w, FIRST LEG. M, LATERAL VIEW OF FEMALE, o, SEVENTH LEG, p, UROPOD. q, FIRST 



I'LEOPODOF FEMALE. C. LAST SEGMENT OF ABDOMEN AND UROPODA. S, SECOND PLEOPOD OF MALE. 



t, EXTREMITY OF OUTER BRANCH OF UROPOD. 



some and much narrower, with the epimeral plates small and appressed; 

 last segment obtusely rounded at the tip, with a slight angle on each 

 side. Eyes very large, oval, extending down the sides of the cephalon. 

 Antennulog with the first joint rather thick; second longer, but much 

 narrower; both armed at the tip inside with three rather long diverg- 



