122 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



which is continued obliquely inward and backward halfway to the 

 median line ; surface outside this ridge concave, so that the posterior 

 dorsum appears very narrow ; postero-lateral surface also hairy, con- 

 cealing the postero-lateral margin, which is concave; carapace 

 considerably narrower behind than across the middle ; posterior mar- 

 gin sinuous; frontal margin convex, following the antero-lateral 

 arch, but viewed from an oblique anterior direction the front is 

 bilobed. 



Buccal cavity anteriorly truncate. Outer maxillipeds large; 

 merus subspatulate, broadly truncate at summit, inner corner 

 rounded; carpus and propodus of good size, the latter widening a 

 little toward distal end, outer two-thirds of distal margin truncate 

 with rounded angles; inner third less produced and more oblique, 

 bearing a short, broad dactylus which overreaches the propodus. 



Carpus and propodus of chelipeds ornamented with oblique, rugose, 

 hairy lines; propodus thick, distally diminishing; palmar portion 



a 



FlG. 68. DlSSODACTYI.DS BOUUADAIbKl, FEMALE (49231). tt, OOTEIl MAX1LLIPED, X 23; 



b, LEO, X 11. 



very convex below in proximal two-thirds; fingers stout, furrowed, 

 prehensile margins crenulate, meeting when closed, tips acute, turned 

 inward and overlapping. 



Legs short, stout, long-hairy; merus about twice as long as wide; 

 dactyli nearly straight, tapering to a slender, slightly curved, horny 

 tip ; in the first three legs there is a slender, minute, subsidiary spine 

 on the posterior margin, a little distal to the middle. 



Abdomen of male with segments 1 and 2 fused, and also 3 to 6, 

 inclusive; side margins of 2 to 6, inclusive, convex, 7 an equilateral 

 triangle. Abdomen of female with segments separate, the second 

 strikingly longer near middle than at the sides, seventh half as wide 

 as sixth. 



Measurements. Male (23790), length of carapace 3.5, width of 

 same 4.3 mm. Female (49231). length of carapace 6.2. width of same 

 8.1 mm. 



Range. Southern Florida; Jamaica. To a depth of 30 fathoms. 



