48 BULLETIN 97, UNITED STATES NATIONAL -MUSEUM. 



as wide as each frontal lobe. Lateral teeth five, including orbital; 

 the second shallow, separated from the first by a shallow sinus; the 

 third large, blunt, outer margin very arcuate; fourth triangular, 

 with a spiniform tip; carapace widest at this point; fifth tooth very 

 small, not projecting beyond the general outline. Postero-lateral 

 margins moderately converging behind. 



Merus and carpus of chelipeds granulate toward the margins; 

 merus dentate on upper margin; carpus oblong, with a stout bhmt 

 tooth at the inner angle and a few tubercles below it; an anterior 

 transverse groove. Hands smooth and rounded, punctate; fingers 

 dark brown, color not extending to palm; prehensile teeth broad, 

 low, a large one at base of dactylus; no gape. In the female the 



Fig. 21. rAXOPLAX DErUESSA, MALE (25G24), a, Odter mas- 



ILLirED, XU; b, ABDOMEN AND TAUT OF STEKXUM, X 0. 



upper surface of the manus is flattened, with traces of two longi- 

 tudinal carinae and an intermediate furrow. Merus joints of legs 

 roughened on anterior margins, following joints hairy. 



Measurements. — Male (25G24), length of carapace 8.G, width of 

 same 13.5 mm. 



Range. — West coast of Florida to Yucatan Channel and Porto 

 Eico. To a depth of 28 fathoms. 



Material examined. — See page 49. 



Genus GLYPTOPLAX Smith. 



Glyptoplax Smith, Trans. Connecticut Acad. Arts and Sci., vol. 2, 1870, 

 p. 1G4; type, G. pugnux Smith. 



Carapace narrow, hexagonal, xanthoid in form, deeply areolated. 

 Front prominent, well separated from the orbital angle. Liiteral 

 margin 4- to 5-dentate. Orbits and antennae much as in Panoplax. 

 Buccal cavity widening anteriorly. 



