. Bulletin - United States National Museum. Science. 280 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM with a stout median spine near the posterior margin. The rest of the body, except the last two segments, with a row of smaller denticu- late spines along each side of the dorsal midline, one spine on the posterior margin of each segment, including the median division of the genital segment. Rostrum tongue-shaped, constricted at its base, with an angular ledge at the center of each lateral margin, bearing a filiform seta. Penultimate abdominal segment with a row of four spines on its posterior
. Bulletin - United States National Museum. Science. 280 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM with a stout median spine near the posterior margin. The rest of the body, except the last two segments, with a row of smaller denticu- late spines along each side of the dorsal midline, one spine on the posterior margin of each segment, including the median division of the genital segment. Rostrum tongue-shaped, constricted at its base, with an angular ledge at the center of each lateral margin, bearing a filiform seta. Penultimate abdominal segment with a row of four spines on its posterior margin, each tripartite at its tip. Caudal rami stout, three times as long as wide, apical setae about half the body length. First legs narrow and elongate, especially the basipod segments; exopod 2-segmented, scarcely more than one-third the length of the basal endopod segment. First antennae 6-segmented, the four basal segments five times as long as the two terminal segments; exopod of second antenna attached to the side of the basal endopod segment, 1-segmented, with four setae. Distal segment of fifth legs strongly constricted at its base, 3- lobed at its tip, each lobe with one seta, the inner one the longest. Basal expan- sion reaching beyond the tip of the distal segment, much narrowed at its tip, with one apical seta and three widely separated ones on its inner margin. Total length, mm. Male.—About the same length as the female, but more slender. First antennae enlarged, the fourth segment swollen pos- teriorly and with two or three anterior toothlike processes, the terminal segment ending in a sharp point. Exopod of third legs very wide and stout, its end segment twice the length of the second segment, with seven coarse spines, three apical, two outer, and two inner. Third endopod 3-segmented, the spine at the distal corner of the middle segment reaching the tip of the end seg- ment. Distal segment of fifth legs very small, 3-lobed at its tip, each lobe wit
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
