THE CRUSTACEA OF NEW JERSEY. 117 



Fifth legs some distance from margin on ventral surface. Abdo- 

 men small and entirely hidden in dorsal view. Anal laminae also 

 small, with very short and nonplumose spines. Terminal joints 

 of second maxillipeds enlarged and fleshy, reniform, with rough 

 scaly surface. Leg's all biramose, rami of third and fourth pairs 

 minute and rudimentary. Egg-strings narrow and much longer 

 than body. 



Male. — Carapace, including posterior lobes, elliptical, slightly 

 longer than wide, narrowed anteriorly, posterior lobes long and 

 narrow, and posterior margin between lobes nearly straight. Eyes 

 three in a row, median much smaller than others. Free thorax 

 segments, about same length, diminishing regularly in width. 

 Genital segment small, subquadrangular, with fifth legs very 

 prominent at posterior corners. Abdomen large, one-jointed. 

 Anal laminse large and arnied with long plumose setae. Second 

 antennae larger than in female, but with adhesion pad much 

 reduced in size. Second maxillipeds with stout curved terminal 

 claw shutting down against a pair of corrugated knobs as in 

 Pandarus. Swimming-legs all biramose, rami of fourth pair in- 

 distinctly segmented, of other pairs two-jointed. 



Perissopus communis R. Rathbun. 

 Plates 30 and 31. 



Perissoptis communis R. Rathbun, Proc. U. S. Nat. Mus., X, 1887, p. 560, Pis. 



29-30. Vineyard Sound, Massachusetts; Noank, Connecticut; mouth of 



St'. Mary's River and Pensacola, Florida. 

 P-erissopiis communis var. stimpson R. Rathbun, 1. c, p. 560. Great Egg 



Harbor, Nezv Jersey. 

 Perissopus de^itatus (nee Steenstrup and Liitken) Leidy, Proc. Acad. Nat. 



Sci. Phila., 1888, p. 165. Beesley's Point, New Jersey (on fin of shark). 



Description of female. — Carapace generally partly elliptical, 

 scarcely narrowed in front, and greatest width slightly posterior 

 in length. Lateral edges slightly convex or almost straight. 

 Hind lobes short, angular. Hind edge of carapace straight or 

 slightly concave, and sometimes small spine either side. Frontal 

 plates narrow, distinct, with broad shallow median emargina- 

 tion. Eyes mostly invisible in adult, distinct in young, as three 



