RATHB UN— MARINE BRACHYURA 201 



filled by the antenna which reaches sideways to the outer angle of the orbit. The basal 

 segment of the antennule is furnished with a hard plate with spinulous edges and a brush 

 of hairs underneath, which does not close the antennular aperture. 



Margin of pterygostomian region coarsely granulated and obtusely angled. The roof 

 of the efferent branchial channels ends in a broad smooth lamina with finely granulated 

 edge ; distal half of maxillipeds spinulous ; a spinule tips the merus of the endognath, 

 while the largest spinules are at the proximal third of the merus and near the distal end 

 of the ischium. Abdomen more finely granulate than sternum ; 6th segment slightly 

 wider than long. 



Chelipeds four times as long as carapace exclusive of spines ; slender, finely frosted ; 

 merus cylindrical, swollen at articulation with carpus ; carpus and hand prismatic, the 

 latter widening a little distally, and more than twice as long as fingers, which are equal, 

 grooved, and meet along their denticulated edges except for a narrow gape at the base. 

 The legs diminish noticeably in length from first to fourth ; the first reaches nearly to end 

 of arm, the last is about § as long as first ; a fringe of soft hair on upper margin of 

 dactyli. 



In smaller specimens the granulation is more visible to the naked eye, and the 

 pterygostomian region is bordered by slender club-shaped spinules ; the posterior and 

 lateral spines are longer, the tip of the intestinal region is prolonged in a spine ; the 

 chelipeds are shorter, 3^ times as long as carapace (in £ about 2§ times), the palm not 

 twice as long as fingers. 



21. Persephona fugax (Fabricius). 

 Myra fugax Alcock (2), p. 202. 



Cargados Carajos, 30 fms., Sta. B 8, Bl5, Bl6, B 17 ; 1$ immature, 10 juv. 



These 11 specimens are similar, and vary from 1 8*3 mm. wide (hinder part broken) 

 to 9 "3 mm. wide. The fine granulation is rather evenly distributed over the carapace; 

 there is no tooth or denticle on the postero-lateral margin or on the antero-lateral margin 

 behind the branchio-hepatic sinus ; the teeth at the ends of the posterior margin are 

 rectangular, blunt ; the median is short, stout, acute. 



22. Persephona brevimana (Alcock). 

 Myra brevimana Alcock (2), p. 20G. 

 Persephona brevimana Ba,thbun, 1906, p. 891. 

 Seychelles, 44 fms., Sta. F 6 ; 1 ovigerous ?. 

 The median carina is scarcely evident. 



23. Persephona darnleyensis (Haswell). 

 Myra darnleyensis Alcock (2), p. 207. 



Seychelles, 39 fms., Sta. F 3 ; 1 $ without chelipeds : 34 fms., Sta. F 8 ; 1 $. 



In the smaller of the specimens, 10*8 mm. wide (from F 8) the "cruciform constella- 

 tion" of granules is plainly visible; in the larger one, 11 "8 mm. wide, it is very faintly 

 indicated. 



26—2 



