. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 375 gent, with very short apical setae. Second antenna with a stout apical claw; spine on second segment of this antenna furcate; fifth legs two small knobs, each with a single apical seta. Total length, FiGDRB 229.—Copilia mira'bilis: a, Female, dorsal; 6, male, dorsal; c, male, fourth leg (after Brady) Male.—Head separated from first segment; first and second free segments wider than the head, the rest of the body tapered back- ward; second antenna very slender, the proportionate lengths of i
. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 375 gent, with very short apical setae. Second antenna with a stout apical claw; spine on second segment of this antenna furcate; fifth legs two small knobs, each with a single apical seta. Total length, FiGDRB 229.—Copilia mira'bilis: a, Female, dorsal; 6, male, dorsal; c, male, fourth leg (after Brady) Male.—Head separated from first segment; first and second free segments wider than the head, the rest of the body tapered back- ward; second antenna very slender, the proportionate lengths of its segments as 9:8:5:8; spine on inner margin of second segment falcate and unbranched. Total length, mm. Family ERGASILIDAE Genus ERGASILUS Nordmann, 1832 Body cyclopslike, narrowed posteriorly; head sometime^ fused with, sometimes separated from, the first segment; urosome 4-seg- mented in female, 5-segmented in male, one-third as long as meta- some or less; caudal rami short. First antennae 6-segmented; sec- ond antennae 3-segmented, the apical claw greatly enlarged and used for prehension; mouth parts removed some distance behind the second antennae; mandibles setose; maxillipeds entirely lacking in the female, present and strongly developed in the male. Rami of first four pairs of legs 3-segmented, except the fourth exopods, which are sometimes 1- or 2-segmented; fifth legs uniramose, 1-segmented, rarely obsolete. Two ovisacs, eggs small and numerous. Females parasitic on the gills of fish, males free swimmers; found in both fresh and salt Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. O
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