COPEPODS OF THE WOODS HOLE KEGION 



395 



Distribution. — British seas (Lubbock, Brady, Thompson, Bourne). 



Color. — Body reddish brown, deepest in the male in the genital 

 segment and the bases of the swimming legs. 



Female. — Body elongate; cephalic segment a half longer than the 

 rest of the thorax, with nearly parallel lateral margins; free seg- 

 ments and urosome tapered regularly backward; genital segment 

 twice as long as first abdominal segment, and the latter is a half 

 longer than the anal segment ; caudal 

 rami longer than wide, parallel, nar- 

 rowed distally, each with five mar- 

 ginal setae and one dorsal. First 

 antennae three-fourths as long as the 

 cephalic segment, indistinctly seg- 

 mented; fifth legs subcylindrical, 

 twice as long as wide, narrowed dis- 

 tally and fringed on the inner margin 

 with cilia, each with two long apical 

 setae. Total length, 3.2 mm. 



Male. — B o d y elongate ; cephalic 

 segment little more than half the 

 length of the rest of the body ; second, 

 third, and fourth segments regularly 

 tapered backward; fifth segment ab- 

 ruptly narrowed to half the width of 

 the fourth segment. Urosome 4-seg- 

 mented, the same width as the fifth 

 segment; genital segment and first 

 two abdominal segments the same 

 length, anal segment less than half as 

 long. Terminal segment of first an- 

 tennae tipped with a series of peculiar 

 comblike structures extending diag- 

 onally across the dorsal surface. To- 

 tal length, 1.4-2 mm. 



Remarks. — The female of this species may be recognized by the 

 shape and armature of the fifth legs, the male by the peculiar comb- 

 like armature of the first antennae. This is the first record of the 

 species outside of the British seas. 



Figure 243. — Monstrilla anglica: a, 

 Male, dorsal (after A. Scott) ; b, 

 male, first antenna 



Genus CYMBASOMA Thompson, 1888 



Body elongate and cylindrical; head fused with the first segment 

 and about half the entire body length; urosome 2-segmented in 

 female, 3-segmented in male; caudal rami short and club-shaped. 



