ISOPODS OF NOKTH AMEEICA, 



311 



the two sexes of the same species. Similarity of habitat and colora- 

 tion are the reasons he gives for this conclusion, together with the 

 fact that all the specimens which he col- 

 lected of the one were females and of the 

 other males. An examination of the speci- 

 mens at my disposition gives the same 

 results in regard to the sexes. Still I 

 place Dynamene tuber culosa with much 

 hesitation un the synonymy of Cilicsea 

 cordata as representing the female, inas- 

 much as several males of the genus I)y- 

 nameneh&ve been found which are in every 

 respect similar to the females. 



Description of mala. Body attenuated 

 in front; color a faint yellow, profusely 

 marked with a delicate pink tint. 



Head with the anterior margin thick- 

 ened, and slightly produced in front. 

 Prominent median point triangularly 

 shaped. Frontal margin broadly lobed 

 on either side of median point. Eye 

 situated at post-lateral angle of head. 

 First pair of antennae reach beyond the 

 posterior margin of head; first joint of 

 peduncle oblong; second joint very short; 

 flagellum consists of about nine articles. 

 The second pair of antenna? extend to the 

 posterior angle of the third thoracic segment; the iiagellum consists 

 of about fifteen articles. 



The thoracic segments are about equal in length, with the exception 

 of the first, which is a little longer than any of the 

 others. The epimera are very broad and drawn out 

 to an apex, which is rounded. They are scarcely 

 visible in a dorsal view, as they project downward 

 laterally, forming an angle with the segments. The 

 last thoracic segment is furnished with low tubercles 

 on its posterior margin. 



On the first abdominal segment are five double 

 tubercles. The terminal segment of the body has 

 three sinuses, one above another, the two upper 

 openings being heart-shaped. Six teeth are grouped 

 in series of two each, and are placed in such regu- 

 larity as to give the appearance of a triple sinus. 

 At the base of the upper sinus is a large rounded tubercle, peaked at 

 the top. Three double tubercles are also situated at the base of the 

 abdomen. The inner branch of the uropoda is fixed and immovable; 



FlO. 33G. ClLIC.EA CORDATA (MALE). 



a, HEAD AND FIRST THORACIC SEG- 

 MENT. &, DORSAL VIEW, x 8. 



FIG. 337. CILIC^A 

 CORDATA. MAX- 

 ILLIPED. X 27}. 



