. Bulletin - United States National Museum. Science. 282 BULLETIlSr 15 8, UNITED STATES NATIONAL MUSEUM legs ver}' narrow and elongate, those of the fourth pair reaching the abdomen. Basal expansion of fifth legs not reaching the center of the distal segment, with four apical setae, the second inner one plu- mose and more than twice the length of the others, which are smooth. Distal segment five times as long as wide, with three apical setae and three on the outer margin; the inner apical one the longest. Total length, mm. Male.—First anten- nae geniculate, 8-seg- mented, the fourth se
. Bulletin - United States National Museum. Science. 282 BULLETIlSr 15 8, UNITED STATES NATIONAL MUSEUM legs ver}' narrow and elongate, those of the fourth pair reaching the abdomen. Basal expansion of fifth legs not reaching the center of the distal segment, with four apical setae, the second inner one plu- mose and more than twice the length of the others, which are smooth. Distal segment five times as long as wide, with three apical setae and three on the outer margin; the inner apical one the longest. Total length, mm. Male.—First anten- nae geniculate, 8-seg- mented, the fourth segment greatly elon- gated and thickened, the distal aesthetask attached to the ante- rior margin of the end segment at its center. The first endopod is a little longer than the exopod, its basal segment almost twice the length of the dis- t a 1 segment, with scattered hairs along the inner margin and a spine at the distal corner. The second endopod only reaches the center of the sec- ond exopod segment, its distal segment longer than the basal segment, with one apical plumose seta, one inner filiform seta, and a group of three spines at the outer distal corner. Basal expansion of fifth legs very short and tipped with two setae; distal segment four times as long as wide, with three apical and one outer seta. Total length, mm. ReTTiarhs.—This is a pelagic species and belongs in tropical and warm temperate regions, only appearing as an immigrant within the. Figure 174.—Macrosetella gracilis: a. Female, lateral; b, male, first antenna; c, male, fifth leg; d, female, fifth leg. (From W. M. Wheeler). 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 sal
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