. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 437 Male.—Carapace orbicular, as wide as long; posterior lobes wide, straight, and bluntly rounded; no accessory lobes; no lateral plates on second, third, or fourth segments. Fourth segment narrower than genital segment, contracted into a short waist posteriorly. Genital segment elliptical, longer than wide, rudiments of sixth legs smaller than those of fifth pair, the former unarmed, the latter armed with setae. Abdomen 2-segmented, segments equal; caudal rami each with four apical setae, all equidistant f
. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 437 Male.—Carapace orbicular, as wide as long; posterior lobes wide, straight, and bluntly rounded; no accessory lobes; no lateral plates on second, third, or fourth segments. Fourth segment narrower than genital segment, contracted into a short waist posteriorly. Genital segment elliptical, longer than wide, rudiments of sixth legs smaller than those of fifth pair, the former unarmed, the latter armed with setae. Abdomen 2-segmented, segments equal; caudal rami each with four apical setae, all equidistant from one another. Total length, 6 mm. Rema/rhs.—The female can be recognized by the wide circular sixth segment plate and the short triangular caudal rami, the male by the absence of accessory lobes on the posterior margin of the carapace and of lateral dorsal plates on the second segment. PANDARUS SINUATUS Say Figure 275 Pandai'us simiatus Sat, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, p. 436, 1S18.—Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 417, pis. 32, 33, 1907. Occwrrence.—Found in abundance on the fins of the common sand shark, the great white shark, the smooth dogfish, the dusky shark, the mackerel shark, the brown shark, and once on the menhaden. Distnhution.—Woods Hole area (S. I. Smith, R. Rath- bun, M. J. Rathbun, McClendon, Wilson); Beaufort, N. C, Great South Bay, Long Island (Wil- son). Color.—Female yellow or yel- lowish white, with a wide curved band on each side of the carapace and a large spot in the center of the dorsal plates of the fourth segment brown or black. In ma- ture females the oviducts give the genital segment a grayish or brownish tinge. Male yellowish and transparent, without the pigment markings. Female.—Carapace less than half the entire length, with a sinuate margin between the posterior lobes; dorsal plates of the second seg- ment broadly elliptical, divergent, reaching the center of the plates on the fourth segment. Plates of
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