THE CRUSTACEA OF NEW JERSEY. 109 



shutting- down between two large corrugated knobs on ventral 

 surface of latter. Mouth-tube and maxillate peculiar, former 

 conical with with swollen base, tapering rapidly to fairly sharp 

 tip, from which ends of mandibles protrude. Latter straight, 

 coarsely toothed along inner edges, teeth more or less rectangu- 

 lar. Maxillae enormous, club-shaped, each one large as whole 

 mouth-tube and two-jointed, its hemispherical terminal joint cov- 

 ered with small curved spines. On ventral surface of each max- 

 illa, at base of terminal joint, a small knob represents rudiments 

 of exopod. Swimming-legs biramose, rami two-jointed except of 

 fourth pair, which modified into large laminae with indistinguish- 

 able joints. Basal joints of exopods of first two pairs much 

 larger than terminal .joints and armed with stout spine at outer 

 distal corners, one on legs exceptionally large. Segments of third 

 legs all same size, while in fourth legs rudimentary endopod sev- 

 eral times larger than exopod. In latter legs also large fold of 

 skin caught up on ventral surface of each basal joint. When legs 

 are in place this fold fits into groove between abdomen and gen- 

 ital segment, doubtless assisting materially in holding egg-masses 

 in place. Coils of oviducts in front part of genital segment, 

 estimated about twenty-five times length of body. Strings nar- 

 row, and eggs thin, so that several thousand to a string. They 

 are held securely between dorsal plates of genital segment and 

 lateral lobes of abdomen until hatched, the nauplii escaping at 

 the hind end of the egg-bag. 



Color uniform yellowish-white, turning orange-brown in alco- 

 hol in center of different carapace areas and dorsal surface of 

 genital segment. Anterior ventral surface of -abdomen and 

 edges of dorsal plates of genital segment with a few spots of 

 light brown. Egg-masses deep orange-brown. Total length 

 30 mm. 



Male. — Carapace as in female, with sam,e grooving on dorsal 

 surface. Cephalic and thoracic portions of lateral areas not dif- 

 fering as much in size as in other sex, and posterior sinus rather 

 deeper. Lateral lobes on second segment and dorsal plates on 

 third and fourth segments correspond closely with female, last 



