COPEPODS OF THE WOODS HOLE REGIOIS' 



413 



Distribution. — Not found outside the present area. 



Color. — Body a uniform pinkish yellow, with spots of purple- 

 brown pigment scattered evenly over the entire dorsal surface, so that 

 the color is uniform everywhere ; eye deep red. 



Feinale. — Carapace ovate, widest posteriorly; fourth segment half 

 the width of the genital segment, much narrowed in front of the 

 fourth legs; genital segment nearly as wide as long, with parallel 

 sides and rounded corners, without 

 lobes but with rudiments of fifth 

 legs on the ventral surface. Abdo- 

 men 1-segmented, wider than long ; 

 caudal rami very short and wide. 

 Branches of the furca strongly 

 flattened, roundly truncated, much 

 wider than long, with radiating 

 ridges; fourth legs 4-segmented, 

 with five spines and one seta. 

 Total length, 6.5-7.5 mm. 



Male. — Carapace nearly twice 

 as long as the rest of the body; 

 fourth segment diamond-shaped, 

 a little more than half the width 



Figure 260. — Lepeophtheirus edwardsi: 

 a. Female, dorsal ; b, female, fourth 

 leg 



of the genital segment ; the latter wider than long, with the rudiments 

 of two pairs of legs at its posterior corners. Abdomen 1-segmented, 

 one-third the length and width of the genital segment; fourth legs 

 4-segmented, with five spines and one seta, the spines with dentate 

 flanges. Total length, 3-3.6 mm. 



Remarks. — This species may be identified most easily by the struc- 

 ture of the furca, and is quite common on the two flounders men- 

 tioned above. 



Family TREBIDAE 



Genus TREBIUS Kr0yer, 1838 



Head fused with first and second thoracic segments, third and 

 fourth segments free and without dorsal plates; carapace strongly 

 arched dorsally ; no lunules ; genital segment well developed, without 

 lobes. Abdomen narrow and elongate, 1- to 3-segmented; all four 

 pairs of legs biramose, rami of first pair 2-segmented, of other three 

 pairs 3-segmented, fourth endopod sometimes 2-segmented ; tw^o pairs 

 of leg rudiments on genital segment in male, one pair in female; 

 maxillary hook and furca both present as in the Caligidae ; maxillae 

 simple or bipartite. 

 71937—32 28 



