BRACHYURA. RATHBUN. 103 



The four young crabs registered E.5196, probably repre- 

 sent one of the earliest stages of the crab-form. The cara- 

 pace is very narrow, as may be seen from the measure- 

 ments, and subquadrate, the sides being parallel except 

 just behind the orbit ; the two lateral spines are nearly the 

 same size and shape. The granules of the palm are 

 arranged partly in longitudinal rows and mixed with fine 

 hair. 



Family XANTHID^E. 

 Subfamily XANTHIN^E. 



XANTHO BOWENENSIS, sp. nov. 

 (Plate xx.) 



Type-locality. S'even miles north-north-east of Bowen, 

 Queensland, 16 fathoms; E.3097; one male, holotype. 



Measurements. Male holotype, total length of carapace 

 31, greatest width, at last pair of lobes, 46.3, fronto-orbital 

 width 17.6, front 10 mm. 



Description. Carapace very convex fore and aft, closely 

 covered with uneven granules, which are smaller in the 

 depressions ; anterior two-thirds well areolated, areoles 1 L 

 and 2 L fused, 1 and with 3 L and 4 L high and Act&a-like 

 5 L and 6 L lower and partially fused ; a small, transverse, 

 oval areole on the posterior cardiac region ; anterior 

 mesogastrium very narrow; protogastric regions unevenly 

 and incompletely divided ; epigastric lobes distinct. Of the 

 four lateral lobes, E is very low, N and T are obtuse-angled, 

 S is rounded. Front not visible in dorsal view; median 

 fissure closed, its sides overlapping ; on each side a truncate 

 lobe occupies! less than half the front ; a broad, shallow 

 sinus separates it from the pointed outer tooth; no supra- 

 orbital angle. Suborbital region, reaching to a line from 

 the buccal angle to lateral tooth N, roughly granulous like 

 the dorsum. The fissures either side of N are continued 

 on the lower surface where they almost meet in a small, 

 circular depression. 



Chelipeds equal in male, closely granulous, the granules 

 smaller and smoother on the merus than on the carpus and 

 propoclus; carpus slightly furrowed; chelae short, stout, 

 tapering distally ; fingers black, fluted, with blunt tips, and 

 meeting when closed. 



1 See Dana Crust. U.S. Expl. Expecl., part i., 1852, p. 29. 



