THE CRUSTACEA OF NEW JERSEY. 383 



on upper surface, and these mostly with small tubercles. Ambu- 

 latory legs long, slender, and gradually smaller to last pair. 

 Dactyls all rather small. Longer anterior legs formed by length- 

 ened propodus and carpus, as meral joints mostly uniform. Legs 

 with body generally, especially lower surface, more or less hairy. 

 Outer or distal joints of legs usually quite velvety. Post-abdo- 

 men quite broad in female, covering region between all coxal 

 articulations. Pleopods rather long, slender, setous. Color 

 muddy-brown to olive generally. Length of carapace 30 mm., 

 width 19 mm. 



Remarks. — A northern species, .attaining its most southern dis- 

 tribution off the shores of Carolina, where it is apparently not 

 common or met with, except in deep water. Northward it ranges 

 to the Arctic regions, mostly in deep water. It appears to be a 

 favorite food of the codfish. In New Jersey it has been found 

 only in Great Egg Harbor. It lives off shore on sandy or gravelly 

 bottoms of the sea, and is recorded from five and one-half to 

 nine hundred and six fathoms depth. I have not examined any 

 New Jersey examples. 



Genus LI BIN I A Leach. 

 The Spider Crabs. 



Libinia Leach, Zool. Miscell., II, 1815, p. 129. Type Libinia rinarginata 

 Leach, monotypic. 



Carapace convex, tuberculous or spinous, triangular orbiculate 

 and evenly rounded behind frontal region, or oblong, orbiculate 

 and constricted behind laterally dilated heptic regions. Preocular 

 spine usually disitinct. Rostrum emarginate or bifid at apex. 

 Orbits small, nearly circular, sometimes with an open fissure in 

 upper and lower margins. Basal antennal joint moderately en- 

 larged. Merus of exterior maxihipeds truncated at distal end. 

 Chelipeds well developed. Palm elongated and fingers evenly 

 denticulated on inner margins. Ambulatory legs well developed, 

 sometimes elongated and joints subcylindrical, usually unarmed. 



Species several. 



