205 



terminates distally into a triangular, erect tooth. Carpopodite likewise granulate towards the 

 margins, inner angle sharpened, but not produced, with a tuft of hairs projecting beneath it. 

 Chela (fig. 2<5) high; palm nearly as high as long and longer than the fingers, upper and under 

 border rounded, not keeled, both surfaces smooth and shining, but the lower part of the 

 outer surface is occupied in its proximal part by a few depressed granules, 

 particularly in the left chela, similar granules are seen running in a longitudinal row near and 

 parallel to the under border of the chela, and there are also some crowded and small granules 

 near the upper border, which is provided with a row of long hairs, continued for some distance 

 on the back of the movable finger; the fingers are short, not much curved, bisulcate both at 

 inner and at outer surface, and the crenulations of the fi.xed finger are larger than those of 

 the opposite one. 



The ambulatory legs are moderately elongate and not much differing in length, the 

 penultimate pair being little more than twice as long as the carapace; all the legs are fringed 

 with coarse, yellow hairs, especially along the last three joints. Meropodites with some transverse 

 rugosities on the upper surface, four times as long as broad, unarmed near the distal end ; in 

 the last pair the meropodite is hairless along the greater part of the anterior margin, the 

 posterior margin is provided all along with numerous hairs, exceeding frequently in length the 

 breadth of the meropodite. Dactyli of all the legs conical, falciform, shorter than preceding 

 joints, thickly fringed with hairs; those of the last pair are nearly straight, but not curved 

 dorsally; their shape is .somewhat obscured by the coating of long hair. 



The first segment of the abdomen of the cT (fig. 2c) is broadened, but clearly falls short 

 of the coxopodites of the last pair of legs; the second segment is much narrower; the third 

 again widens to the breadth of the first segment and projects into two somewhat acuminate 

 prominences; the following segments gradually decrease in width, but increase in length; the 

 terminal segment is semi-elliptical, longer than broad. 



This species inhabits shallow waters, in the Chinese Sea, the Gulf of Siam, the Andaman 

 Sea and Torres Straits. 



Dimensions in mm. : 



Fronto-orbital distance 8. — 



Width of front between eye-stalks . . . 4.5 



Greatest breadth of carapace 14.5 



Length of carapace Ii. — 



2. Ceratoplax trtmcatifrons Rathbun. PI. 12, Fig. i. 



1914. Ceratoplax truncatifrons Rathbun. Proc. U. S. Nat. Mus., v. 48, p. 147. 



Stat. 193. Sula Besi, Sula Islands, east of Celebes. Depth 22 m. 2 cT, 5 2- 



This small species is at once recognized by its remarkably smooth and shining 

 carapace (at least in the cf, in the 9 the carapace is crowded with small punctae), that is 

 perfectly bare; there are only some hairs across the front and the eye-stalks, and the lateral 

 margins are shortly pubescent, like also the subbranchial regions, and of a ruddy brown colour. 



57 



SIEOGA-EXPEDITIE XXXIX^-'. ^7 



