ISOPODS OF NORTH AMERICA. 



591 



" Body slightly granulated, very convex, and narrowed backward, 

 the side parts of the pereion (segments 2-7) and of the pleon tending 

 downward. Cephalon: prosepistoma with a shield-like triangular 

 convexity; the prosepistoma is continuous with the forehead in the 

 middle and separated from it on both sides by a transverse, incomplete, 

 preocular cut. Eyes moderate; ocelli about 12. Antennse short; 

 flagellum small, first joint four times shorter than the second. Pereion: 

 first segment with the antero-median tubercle hardly perceivable; 

 coxopodites distinct on the entire length of the edge of the segment. 



FIG. 651. ETHELUM REFLEXUM (AFTER DOLLFUS). a, HEAD AND FIRST TWO SEGMENTS OF THORAX 

 (UPPER SIDE), b, THE SAME (UNDERSIDE), c, FIFTH AND SIXTH SEGMENTS OF ABDOMEN AND URO- 



PODA (UPPER SIDE), d, THE SAME (UNDERSIDE). 



Coxopodite of the second segment hidden under the bent side part 

 of the segment. Pleon, telson: the lateral parts being nearly folded 

 underneath, the hind edge of segments (3-5) seems straight from a 

 dorsal view. Pleotelson flat, with curved sides and a blunt, rather 

 rounded apex. Uropoda: basis with a large oblong processus; endo- 

 podite reaching to two-thirds the length of the pleotelson; exopodite 

 small, placed at the top of the basal processus. Color: dark brown, 

 flagellum whitish. Dimensions: 5 by 2 mm. (much decreasing back- 

 ward." DOLLFUS." 



Proc. Zool. Soc. London, 1896, pp. 398-399. 



