442 REPORT OF NEW JERSEY STATE MUSEUM. 



inch or more in diameter, and not so numerous as those of the 

 Uca. It can pinch, however, quite effectiv-ely with the large 

 chehpeds, unhke Uca, though it is less active in its movements. 



I have examined Say's type, of which only the imperfect 

 dried carapace remains. It is labeled from New Jersey. Be- 

 sides this is also a dried example from Dennis Creek, obtained 

 many years ago. 



Genus PLANES Bowdich. 



Tile Gidf-wccd Crabs. 



Planes^ (Leach) Bowdich, Excursion to Madeira, 1825, p. 15. Type Planes 



clypeatus Bowdich, monotypic. 

 Nautilograpsus Milne-Edwards, Hist. Nat. Crust., II, 1837, P- 89. Type 



Cancer iiiinufus Linnaeus, monotj-pic. 



Carapace subcjuadrate, with postero-lateral margins somewhat 

 convergent, dorsally smooth and slightly convex, and usually with 

 slightly indicated lateral postorbital tooth. Front broad, usually 

 about half width of carapace, and anterior margin slightly pro- 

 jecting and nearly straight. Orbits small, margins entire or with 

 only very small notch beneath eye-peduncles near exterior orbital 

 tooth. Epistoma short, broadly transverse. Longitudinal ridges 

 of endostome distinct and well defined. Post-abdomen in male 

 distinctly seven-jointed, its basal segments occupying whole width 

 of sternum between coxae of ambulatory legs. Eye-peduncles 

 short and thick. Antennules transversely plicated. Basal joint 

 of antenucie short and robust, produced to edge antero-external 

 of orbit, flagellum short. Exterior maxillipeds have rhomboidal 

 gape, merus joints distally truncated and their anterior margins 

 even slightly concave, and carpal joints articulated near rounded 

 antero-external angles of merus joints. Chelipeds (in adult 

 males) rather robust, subequal, of moderate size, merus trigonous, 

 with anterior margins dentated, carpi with tooth or spine on in- 

 terior margins, palms somewhat turgid and rounded above, and 



Wlso used by Rondani 1864. and Saussure 1883, in Insects. 



