284 BULLiETIN 15 8, UNITED STATES NATIONAL MUSEUM 



acuminate spine at its inner distal corner; second endopod reaching 

 the tip of the middle exopod segment, its end segment twice as long 

 as the basal segment, with a short apical spine, two inner plumose 

 setae, and a very short outer filiform seta. Basal expansion of fifth 

 legs triangular, with two apical setae ; distal segment with three 

 apical and one outer setae; rudimentary sixth legs present at poste- 

 rior corners of the genital segment. Total length, 1.15-1.3 mm. 



Remarks. — This species can be recognized by the cuticular lenses 

 on the front of the head and the long apical setae of the caudal rami. 

 It is the same as Dana's Miracia gracilis, but, as Sars has shown, 

 it can not belong to the genus Miracia, but is a true Macrosetella. 

 The locality where the present specimens were obtained is not 

 within the Woods Hole area, but is so near to it that the species is 

 very likely to be found within the area in the future. 



Genus MIRACIA Dana, 1846 



Body elongate, slender, and tapered gradually backward; head 

 fused with the first segment and laterally compressed, with two 

 large cuticular lenses on the forehead; urosome 4-segmented in 

 female, 5-segmented in male; genital segment distinctly divided; 

 caudal rami long and slender, their apical setae scarcely longer than 

 the rami. First antennae 8-segmented, geniculate in the male; exo- 

 pod of second antenna small, 1-segmented, and attached to the side 

 of the basal endopod segment. Exopods of first four pairs of legs 

 3-segmented, first endopod 2-segmented, second, third, and fourth 

 endopods 3-segmented in female, second endopod 2-segmented in 

 male; fifth legs 2-segmented and elongate. One species found here. 



MIRACIA EFFERATA Dana 



Figure 176 



Miracia efferata Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 53, 1849. — 

 Beady, Voyage of H. M. S. Challenger, vol. 8, pt. 23, Copepoda, p. 102, 

 pi. 43, figs. 1-16, 1883. 



Occurrence. — One female from the trawl wings at Station 2235, 

 Albatross, off Marthas Vineyard, September 13, 1884, by Rathbun; 

 one female taken in a surface tow on Georges Bank, September 15, 

 1874. 



Distribution. — North Atlantic and South Pacific (Brady) ; tropi- 

 cal Atlantic (Dana) ; Gulf Stream south of Marthas Vineyard 

 (Wheeler). 



Color. — The female is dark greenish blue, becoming yellowish 

 along the margins of the segments ; a large spot on the dorsal surface 

 of the head, extending from the anterior margin back to the center 

 of the cephalic segment, is blue above the eyes and black behind 

 them. The entire dorsal surface of the body has a glistening metallic 



