BRACHYURA. RATHBUN 1-1 



Measurements. --Largest specimen, female, E.3176: 

 Entire length of carapace 25.2, entire width 35, width in 

 front of posterior pair of spines 31.2, width of front, to 

 antennal notches 10.4, width of front and orbits 20.4, 

 width of posterior end of mesogastric region 7.2 mm. 

 Largest male, E.4454: Entire length of carapace 24.4, 

 entire width 31.3, width in front of posterior pair of 

 spines 28.4, width of front to antennal notches 8.9, width 

 of front and orbits 18.8, width of posterior end of meso- 

 gastric region 6.2 mm. 



Description. Front advanced, antero-lateral margins 

 arcuate, postero-lateral margins strongly convergent. 

 Surface covered with short, numerous, but not crowded, 

 single, yellow (in alcohol) hairs which entangle a coat of 

 refuse; regions well marked, branchial region partially 

 subdivided, several (three or four) subacute spines or 

 spinules near the marginal spines. Front subtriangular, 

 lobes with a short inner and lon.g outer slope and rounded 

 tip, edge denticulate; outer tooth single, independent, 

 triangular, spiniform. Inner angle of orbit suberect, not 

 at all advanced. Upper orbital margin with a few spinules, 

 two subequal emarginations, and an outer spine of moderate 

 size. S'pinules of lower orbital margin larger and more 

 regular than those of the upper margin, inner spine the 

 largest. A narrow subhepatic spine is visible in dorsal 

 view where it appears as a second antero-lateral spine; in 

 side view it is in same straight line as three succeeding 

 spines; these are large, sharp-pointed, conical spines, each 

 with one or more spinules on its slope; the first of the 

 three spines points almost directly forward. 



Chelipeds and legs clothed with similar hairs to those 

 on the carapace, but on the legs the hairs are longer: on 

 the chelipeds the hairs are thickest .i.bout the bases of the 

 spines. Chelipeds very unequal ; merus with a terminal 

 and a subterminal spine above, lower border obscurely 

 denticulate, one or two spinules on inner border; carpus 

 armed with scattered, conical, acute spines, the longest- 

 one erect at inner angle. Larger palm covered with 

 numerous, similar spines, pointing distad and sometimes 

 especially in full grown males disappearing toward the 

 lower margin and fixed finger; proximal end of lower 

 margin tuberculate. Each finger has two outer, punctate 

 orooves; the dactylus is tuberculate above at its base. 

 Smaller palm similarly armed, usually all over the outside, 



