424 PROCEEDINGS OF THE NATIONAL MUSEUM. ' vol. xxxiii. 



From sharp-nosed shark, Scoliodon terrx novse, Cat. No. 32771 

 U.S.N.M. (2 females, taken at Beaufort, North Carolina). 



From the outside of a menhaden. Cat. No. 32734, U.S.N.M. (1 male). 



From "Shark," no species given. Cat. No. 8640, U.S.N.M. (6 males 

 taken at station 2237,steamer^Z6aiross,1884); Cat. No. 12670,U.S.N.M. 

 (35 females); Cat. No. 32757, U.S.N.M. (1 male). 



No locahty or host given, Cat. No. 6028, U.S.N.M. (1 female). 



Genus NESIPPUS Heller. 



Nesippus (N. orientalis) Heller, 1865, p. 193. 

 Nogagus {N. augustatus) van Beneden, 1892, p. 246. 



Female.'- — Carapace transversely elliptical, much wider than long, 

 with broad lateral areas and posterior lobes. Frontal plates distinct, 

 prominent, covering the basal joints of the first antenna\ Eyes 

 small, three in number, in a triangle near the anterior margin. Sec- 

 ond and third thorax segments fused together, and carrying a single 

 pair of more or less rectangular plates or lobes on their sides. Fourth 

 segment free, with no dorsal plates, or with a very small pair scarcely 

 overlapping the genital segment. The latter elliptical, mucli longer 

 than wide, with an evenly rounded outline; no posterior lobes. 

 Abdomen small, attached to the ventral surface of the genital seg- 

 ment, and nearly liidden in dorsal view; anal laminae of medium size, 

 wholly visible, each armed with four large setaj. 



First antenna? like those of Pandarus; second pair uncinate; first 

 adhesion pads much larger than the second, the two quite a distance 

 apart. Mouth tube similar to that of Pandarus; second maxilhTp three- 

 jointed, with swollen bases and small terminal claws. 



Second maxillipeds much swollen, witli a flattened termhial claw. 

 All the swimming legs biramose; rami of the first three pairs two- 

 jointed, of the fourth pair one-jointed, all armed with plumose setae. 

 Egg tubes slender, straight, much longer than the body. 



Male. — Body a typical Nogaus form; carapace elongate with nar- 

 row lateral areas and posterior lobes; no accessory lobes, as in the 

 Pandarus males, but sometimes a large spine on the posterior margin, 

 at the base of the posterior lobe on either side. Frontal plates narrow 

 and not very prominent; eyes three in number, in about the same 

 position as in the female; in front of the eyes there is often a pair of 

 rounded knobs (Dana's conspicilla) rising above the surface of the 

 carapace. Free thorax segments the same length but diminishing 

 rapidly in width from in front backward, the fourth as wide as 

 the genital segment; the second segment only with lateral lobes. 

 Genital segment elongate, more or less angular, without lobes or 

 rudimentary swimming legs, or with the latter reduced to small 

 spines. Abdomen small, one-jointed, wider than long, more or less 

 triangular, anal laminas small, but armed with large plumose setae. 



