COPEPODS OF THE WOODS HOLE REGION 



349 



than the anal segment. First antennae 7-segmented ; second antennae 

 3- or 4-segmented; rami of first four pairs of legs 3-segmented, 

 except the fourth endopod, which is 2-segmented; fifth leg 1-seg- 

 mented, elongate, curved, with two apical setae. A single species. 



MACROCHEIRON FUCICOLUM Brady 



Figure 209 



Maorocheiron fucicolum Brady, Nat. Hist. Trans. Northumberland and Durham, 

 vol. 4, pt. 2, p. 434, pi. 18, figs. 9-18, 1872.— Sabs, Crustacea of Norway, 

 vol 6, p. 163, pi. 91, 1917. 



Ocawrrence. — ^A few specimens of both sexes were found in the 

 tow among eelgrass and algae at Katama Bay, Marthas Vineyard. 



DistAhution. — Narragansett Bay and Charlestown Pond (Wil- 

 liams) ; Buzzards Bay (Sharpe) ; British Isles (Brady, Scott) ; 

 Norwegian coast (Sars) ; Liverpool Bay (Thompson). 



Color. — Female semitransparent with a pale yellowish-brown 

 tinge; posterior margins of the head and thoracic segments light rose- 

 red; ovary, oviducts, and eggs olive- 

 green; eye dark red and close to an- 

 terior margin. 



Female. — Metasome regularly ellipti- 

 cal and strongly arched dorsally; cepha- 

 lic segment about twice as long as the 

 rest of the metasome ; no epimeral plates. 

 Urosome half the length of metasome; 

 genital segment about as long as abdo- 

 men, dilated anteriorly. Second seg- 

 ment of first antenna the longest ; second 

 antenna 3-segmented; two basal seg- 

 ments massive, end segment with strong 

 apical claw, irregularly toothed on con- 

 cave margin; fifth leg with two unequal 

 apical setae. Total length, 1-1.25 mm. 



Male. — Smaller than female, metasome 

 relatively narrower; genital segment 

 much inflated. Maxillipeds very strong, 

 3-segmented, basal segment with smooth 

 margins ; second segment with a dense fringe of slender setae on the 

 inner margin and two spines near the center ; third segment a smooth 

 sickle-shaped claw bent abruptly near the base. Other appendages 

 like those of the female. Total length, 0.8-0.95 mm. 



Remarks. — This is a littoral form found at moderate depths among 

 algae. It has been suggested that its food consists of the juices of 

 the algae and small particles picked up on the surface of the fronds. 

 71937--32 24 



FiGUKE i!Uy. — Macrocheiron fuci- 

 colum: a. Female, dorsal (af- 

 ter Sars) ; i, female, fifth leg; 

 c, apical claw of second an- 

 tenna 



