COPEPODS OF THE WOODS HOLE REGION 307 



Male. — A little smaller than the female ; first antenna 8-segmented, 

 with a long slender aesthetask on the third, and another on the 

 fourth segment, the former jointed at its base as in the female, the 

 latter not jointed. Second antennae and mouth parts the same as in 

 the female; end segment of first exopod with two apical plumose 

 setae and a slender spine on the outer margin; end segment of first 

 endopod with one slender apical spine and a coarse, blunt spine, 

 swollen at its center, on the inner margin. The two fifth legs fused 

 into a U-shaped lamina, each arm of which carries three subequal 

 apical spines, curved outward. Total length, 0.4^0.45 mm.. 



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

 shape of the rostrum and the structure of the fifth legs, the male by 

 the structure of the first and fifth legs. Williams's specimens were 

 captured while swimming freely near the surface, but Rathbun ob- 

 tained his material by washing the seaweed taken 

 off the Newport wharf. 



METIS IGNAEA Philippi 



Figure 184 



Metis ignaea Philippi, Arch. Nat., Wiegmann, vol. 1, 

 Jahrg. 9, p. 61, pi. 4, fig. 7, 1843.— Sabs, Crustacea of 

 Norway, vol. 5, p. 345, pi. 228, 1910. 



Occui^rence. — Taken near Chatham, October 26, 

 1915, at Station 10336, Grampus., in a surface tow. 



Distribution, — British seas (Brady) ; coast of 

 Norway (Sars) ; Mediterranean (Philippi, 

 Brian). 



Color. — Body a uniform fiery red, much 



^ ./ 7 FiGDRB 18 4 - Metis 



brighter in hue than the two other species. ignwea: a. Female, 



Female. — Cephalic segment very large, half the ^*t^ leg ; 6, male, 

 length of the body and strongly vaulted dorsally ; ^^ 



rostrum tongue-shaped, deflexed, broadly rounded at the tip, with 

 a pair of subterminal setae; urosome scarcely one-third the length 

 of the metasome ; caudal rami as wide as long, inner apical seta two- 

 thirds as long as the body. First antennae 6-segmented, the two 

 basal segments more or less fused, the aesthetask on the third segment 

 jointed once near its base; basal segment of second antenna shorter 

 than the second segment, the end segment with three coarse apical 

 spines, two on the outer margin and one on the dorsal surface near 

 the center. Fifth legs fused at the base only, each with two minute 

 apical knoblike processes, armed with a single seta, and a third 

 process on the outer margin near the base, tipped with a filiform 

 seta. Total length, 0.5-0.6 mm. 



Male. — Smaller than the female; first antenna prehensile, 8-seg- 

 mented, the penultimate segment produced into a claw at its anterior 



