. Bulletin - United States National Museum. Science. COPEPODS OP THE WOODS HOLE REGION Genus CHIRIDIUS Giesbrecht, 1892 47 Head narrowed anteriorly; fourth and fifth segments completely fused, with slender and sharp spines at the posterior corners. Uro- some 4-segmented in female, 5-segmented in male; caudal rami nearly as wide as long; appendicular bristles short and on the ventral sur- face. Exopods of first four pairs of legs 3-segmented; first endo- pods 1-segmented, second endopods 2-segmented, third and fourth endopods 3-segmented; fifth legs lacking in female, uniramose and 5-segmented
. Bulletin - United States National Museum. Science. COPEPODS OP THE WOODS HOLE REGION Genus CHIRIDIUS Giesbrecht, 1892 47 Head narrowed anteriorly; fourth and fifth segments completely fused, with slender and sharp spines at the posterior corners. Uro- some 4-segmented in female, 5-segmented in male; caudal rami nearly as wide as long; appendicular bristles short and on the ventral sur- face. Exopods of first four pairs of legs 3-segmented; first endo- pods 1-segmented, second endopods 2-segmented, third and fourth endopods 3-segmented; fifth legs lacking in female, uniramose and 5-segmented in male, often with the rudiment of an endopod. One species found here. CHIRIDIUS ARMATUS (Boeck) Figure 28 Euchaeta annata Boeck, Forh. Christianla, 1872, p. 39. Chmdius armatus Sars, Crustacea of Norway, vol. 4, p. 27, pis. 15, 16, Occurrence.âOne male from trawl wings, Sta- tion 2230, Fish Hawk; 12 males and females in a vertical haul. Station 20077, Grampus, east of Cape Cod. Distribution.âNor- wegian coast and fiords (Boeck, Sars); North Atlantic (Cleve); British seas (T. Scott); North Sea (Damas and Koe- foed) ; Greenland (Van- hoffen). Color.â Body trans- â j . Figure 28.âChiridiiis armatus: a. Female, dorsal parent and colorless, with (after Sars) ; b, fifth legs, young male; c, fifth a faint wash of rosy red; ^'^ss, aduit male (r, right leg) intestine in the female bright carmine, in the male much duller and more of a brick red; ovaries and oviducts opaque white; eye dark ruby red (Rathbun). Female.âMetasome nearly three times as long as wide, the spines on the posterior corners of the fifth segment short and somewhat divergent. Head with a very small bifid rostrum; first antennae reaching the first abdominal segment; caudal rami no longer than the anal segment, and a little divergent; exopod of second antennae 7-segmented and one-third longer than the endopod. Total length, 4 Please note that these images are extracted from scanned page i
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