. Bulletin - United States National Museum. Science. 164 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM basally, acuminate and fringed with minute hairs distally. Total length, mm. Male.—Body stout; genital segment neither dilated anteriorly nor protuberant ventrally; caudal rami of normal size, their setae not dilated; fifth legs larger than in the other species, the right leg more than twice as long as the left, its end segment slender, strongly curved and clawlike; second free segment much longer than the first, with a very small inner protuberance. Total length, mm. Reraarhs.—T
. Bulletin - United States National Museum. Science. 164 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM basally, acuminate and fringed with minute hairs distally. Total length, mm. Male.—Body stout; genital segment neither dilated anteriorly nor protuberant ventrally; caudal rami of normal size, their setae not dilated; fifth legs larger than in the other species, the right leg more than twice as long as the left, its end segment slender, strongly curved and clawlike; second free segment much longer than the first, with a very small inner protuberance. Total length, mm. Reraarhs.—This species can be recognized by the size and shape of the caudal rami in the female, together with the dilated bases of the caudal setae and the ventral protuberance of the genital segment; in the male by the unequal length of the fifth legs. It does not seem to occur anywhere in such abun- dance as is common for the other species here enumerated. ACARTIA CLAUSII Giesbrecht FiGtJBE 112 Acartia clansii Giesbrecht, Atti Ac- cad. Lincei, Rome, ser. 4, vol. 5, sem. 2, p. 25, 1889.—Sars, Crus- tacea of Norway, vol. 4, p. 150, pi. 101, 1903. Occurrence.—Surface tow, Hy- annis Harbor, Newport Harbor, and Vineyard Sound by Rathbun; off the Bureau of Fisheries wharf by Fish; surface tow. Station 10331, Gramp%iiS, by Bigelow. Dist7'ihution.—British Isles (T. Scott, Cleve); coast of France (Canu); Mediterranean, North Atlantic (Giesbrecht); Black Sea (Karawajew); Azores, North Sea (Cleve); Norwegian coast (Sars); Alaska, Nova Scotia, Passamaquoddy Bay (Willey); Messina, Nizza (Claus); Malta, Canary Islands (Thompson) ; Adriatic (Car, Pesta) ; northern Atlantic (Cleve); Narragansett Bay (Williams); Chesapeake Bay (Wilson); Gulf of Maine (Bigelow); Woods Hole (Fish). Golo7\—So transparent and colorless as to be practically invisible over a white background, but with enough of a whitish cast to make them apparent over a black background (Rathbun). Fetnale.—No rostral filaments
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