COPEPODS OF THE WOODS HOLE REGION 



283 



present area. It can be recognized by the very long first antennae 

 and apical caudal setae, the latter longer than the body itself. 



MACROSETELLA OCULATA (G. O. Sars) 

 FiGUEE 175 



Setella oculaia Saks, Bull. Inst. Oceanogr., no. 323, p. 13, pi. 7, 1916. 



Occurrence. — Six females and three males were taken in a vertical 

 haul at Station 20076, Grampus, March 19, 1920. 



Distribution. — Southern Pacific (Dana) ; Indian Ocean (Mrazek) ; 

 Station 1696, Prince Albert de Monaco (Sars). 



Color. — Eye a peculiar pale lavender; crown of head ultramarine 

 blue; caudal rami orange-yellow, bases of the large apical setae 

 bright Venetian red; the rest of 

 the body pale yellowish and trans- 

 parent. In the male the eye is 

 much larger than in the female and 

 deep crimson, while the body shows 

 none of the blue, yellow, or red 

 found in the female. 



Female. — Body slender and ta- 

 pered graduall}^ backward, cephalic 

 segment shorter than the rest of the 

 metasome; rostrum long, pointed, 

 and turned downward; front of 

 head projecting a little, with a pair 

 of cuticular lenses like those in the 

 genus Miracia. Urosome as long 

 as the metasome, its segments finely 

 denticulate along their posterior 

 margins; division of genital seg- 

 ment rather indistinct. Caudal 

 rami somewhat flattened, much 

 shorter than in the precedingspecies, 

 their apical setae not so long as the body. Rami of the swimming 

 legs very long and narrow, those of the fourth pair reaching the 

 center of the penultimate abdominal segment. Basal expansion of 

 fifth legs not reaching the proximal fourth of the distal segment, 

 and armed with three setae; distal segment five times as long as 

 wide, with three apical and three outer setae. Total length, 

 1.2-1.35 mm. 



Male. — A little smaller than the female; first antennae consider- 

 ably enlarged and prehensile; genital segment distinctly divided; 

 caudal rami relatively longer than in the female, their apical setae 

 scarcely half the body length. Second basipod of first leg with an 



Figure 175. — Macrosetella oculata: a, 

 Male, lateral ; 5, female, fifth leg ; c, 

 male, fifth and sixth legs 



