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 the third segment circular and 

 separated by a deep median sinus, much enlarged at its base. Plates 

 of fourth segment about as wide as the genital segment and cover- 

 ing the anterior third of the latter, with a wide and shallow median 



Figure 275.— Pandarus sinuatus: a. Female, 

 dorsal ; J), male, dorsal 



