RATHBTJN— MARINE BRACHYURA 



237 



crossed by fine striae ; posterolateral margin sinuous. The front viewed from above 

 is arcuate, but the true edge is invisible, the surface being bent abruptly down ; edo-e 

 viewed from in front, the shape of a cupid's bow, and not separated from the angle of the 

 orbit ; the sides of the front slope gradually into the orbital margin. Orbits pear-shaped ; 

 eyes stout. Two faint notches near together in the superior margin of the orbit ; inferior 

 margin thickened, showing some irregular crenations. Suborbital area granulate. Basal 

 segment of antennules deeply channeled along its ventral face. The flagellum of the 

 antennae is shorter than the major diameter of the orbit. Ischium of maxillipeds longer 

 than merus and produced at the antero-internal angle ; merus with a lobe of good size at 

 its antero-external angle. 



Chelipeds unequal, smooth, punctate ; arm with a thin edge above, having a small 

 blunt tooth near the distal end ; wrist enlarged, a laminiform expansion along its inner 

 side, whose thin, smooth edge can be scraped along the stridulating ridge on the ventral 

 edge of the carapace ; palms swollen ; fingers rather long, coloured like the palm, not 

 gaping, tips curved and crossing, prehensile edges armed with a few acute teeth, the 

 largest one near the base of the larger pollex, the dactyli almost unarmed in their distal 

 half; four impressed lines of punctas on each digit. 



Legs narrow, flat, varying little in length, dactyli scantily hairy. 



Male abdomen small, suboblong, segments of about equal length, save the first and 

 seventh. 



Gonoplacidse. 



183. Eticrate crenata de Haan. 

 Eucrate crenata Alcock (6), p. 300. 

 Seychelles, 34 fins., Sta. F 8 ; 1 ? juv. 



184. Pilumnoplax acanthomeriis, sp. nov. (Plate 18, fig. 13). 

 Amirante, 30 fins., Sta. E 21 ; 1 $ type, 1 ? ovig. 

 Carapace slightly convex ; surface closely covered with granules which are smaller 



posteriorly ; regions indicated by narrow grooves ; front and orbits set off by broad 

 furrows. Front obliquely inclined, f as wide as carapace ; edge sinuous, a median 

 V-shaped emargination, a small lobe at outer corners, between which is a raised transverse 

 granulated line. Orbit separated from front by a rectangular notch ; upper margin with 

 a single notch, prolonged inward by a fissure. Eyes large, reniform. Antero-lateral 

 margin half as long as postero-lateral, quadridentate, including tooth at outer angle 

 of orbit ; first three teeth subequal, first obtuse, second and third acute, third narrower, 

 fourth very small, spiniform, close to third. Postero-lateral margins slightly concave, 

 converging at an acute angle. 



Last joint of antennal peduncle reaches end of outer lobe of front ; flagellum 1^ times 

 as long as width of orbit. 



Chelipeds unequal in both sexes ; arm, wrist and upper part of hand granulate, 

 the large granules acute or spinulifonn ; four spines on inner edge of arm ; two spines, one 

 above the other, at inner angle of wrist; hand with a double row of blunt spines above, 



