. Bulletin - United States National Museum. Science. COPEPODS OP THE WOODS REGION 57 coast of Ireland (Farran); Adriatic (Pesta); California coast (Esterly); Malay Archipelago (A. Scott); North Sea (With). Color.—General body color reddish and not very transparent; the red pigment is distributed very unevenly and is most dense along the midline of the dorsal surface, on the posterior margins of the thoracic segments, especially at the sides of the body, on the dorsal surface of the genital segments, on the long plumose setae of the second antennae, and on the proximal segments of the mou
. Bulletin - United States National Museum. Science. COPEPODS OP THE WOODS REGION 57 coast of Ireland (Farran); Adriatic (Pesta); California coast (Esterly); Malay Archipelago (A. Scott); North Sea (With). Color.—General body color reddish and not very transparent; the red pigment is distributed very unevenly and is most dense along the midline of the dorsal surface, on the posterior margins of the thoracic segments, especially at the sides of the body, on the dorsal surface of the genital segments, on the long plumose setae of the second antennae, and on the proximal segments of the mouth parts. The first antennae, the second pair all except the setae, the distal portions of the mouth parts, the abdomen, and the caudal rami are colorless (Rathbun), Female.—Forehead without a crest but with a rostrum; urosome one-fifth as long as meta- some; genital segment asymmetrical with a sack- shaped protuberance on the dorsal surface at the left of the midline; second outer seta on the right caudal ramus as long as the body; exopod of sec- ond antenna four times as long as endopod; end seg- ment of endopod with five and four setae; basipod of fourth leg with only one or two spines on inner margin. Total length, mm. Male.—Forehead with a low crest and with a ros- trum ; urosome one-fourth as long as metasome and symmetrical; no elongated seta on caudal rami; fifth legs biramose, endopods 1-segmented, the left one very rudimentary, possibly sometimes lacking; left exopod 3-segmented, rodlike, right exopod 2-segmented, end segment with a row of sawteeth on the inner margin. Total length, mm. Remarks.—The female of this species is distinguished by the sack- shaped appendage on the genital segment and the length of the exopod of the second antenna. The male can be told by the structure of the fifth legs. It has never before been reported from the Ameri^ can side of the North Atlantic,. FiGDRE 36.—Euchirella messinensis: a. Female, dorsal; b, male, fift
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