. Bulletin - United States National Museum. Science. 222 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM Female.—Cephalic segment about half of the metasome; rostrum long, prominent, curved downward, and rounded at its tip, with a minute hair on each lateral margin; urosome two-thirds as long as metasome, without spinules; genital segment divided; caudal rami quadrilateral, wider than long. First antennae 8-segmented, two basal segments enlarged; exopod of first legs three-fourths as long as basal endopod segment; distal segment of third exopod with four spines and four setae; distal segment of f
. Bulletin - United States National Museum. Science. 222 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM Female.—Cephalic segment about half of the metasome; rostrum long, prominent, curved downward, and rounded at its tip, with a minute hair on each lateral margin; urosome two-thirds as long as metasome, without spinules; genital segment divided; caudal rami quadrilateral, wider than long. First antennae 8-segmented, two basal segments enlarged; exopod of first legs three-fourths as long as basal endopod segment; distal segment of third exopod with four spines and four setae; distal segment of fifth legs large and foli- aceous, as wide as long, with six setae, the third inner one filiform, basal expansion triangular, scarcely reaching the center of the distal segment, with five setae, the middle one larger and longer than the others. Total length, Figure 149.—Amphiascus cinctus: a. Female, fifth leg; h, male, fifth and sixth legs; c, male, first leg; d, male, second leg Male.—First antennae geniculate, with two long aesthetasks; sec- ond basipod of first legs with a stout curved spine at the inner corner, reaching beyond the center of the basal endopod segment; second endopod nearly as long as exopod, with an apical spine, curved abruptly at the center, and two outer spines, the proximal one widened; distal segment of fifth leg oval, with six setae, the third inner one filiform, basal expansion reaching the middle of the distal segment with two apical setae; rudiments of sixth legs present. Total length, mm. Reiimrks.—The deep pink transverse band on the metasome retains its color in formalin and affords a ready means of identification. The species has never before been reported from our coasts. Brian published figures and descriptions of nauplius and metanauplius stages in Studi del Laboratorio Marino Genova, 1921 (pp. 87-88). AMPHIASCUS SINUATUS Sars Figure 150 Amphiascus sinuatus Sars, Crustacea of Norway, vol. 5, p. 178, pi. 118, 1906.
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