2IO 



longer, club-shaped or feathered ; it is especially the last pair of legs which is thickly fringed. 

 A remarkable feature of this species is the gradual decrease in length 

 of the dactyli from the first to the fourth pair of walking legs^). In the 

 last pair the dactyli are wholly straight, not curved upward and backward. 



The general ivory-white colour of the animal is variegated on the legs by some 

 sharply-defined, ruddy-brown patches, at least in the cf, not in the (young) 9. Firstly there 

 is such a patch on the upper border of the meropodites of the chelipeds ; the first pair of 

 walking legs is devoid of them ; on the meropodites of the second pair again a large patch 

 is found along the upper border; the meropodites of the third pair are deeply coloured over 

 the whole distal half of the dorsal surface and this colour extends anteriorly over the upper 

 border; in the last pair of legs the brown colour is observed all over the under surface 

 of mero-, carpo- and propodite; on these last legs, as well as on the chelipeds, the hairs 

 implanted on the coloured parts are of the same hue, as if impregnated by the colouring 

 matter. These very conspicuous patches, which have apparently lost nothing of their vigour 

 during an alcohol preservation of almost twenty years, afford perhaps an important diagnostic 

 of the species ^). 



6" The third abdominal segment of the cf is somewhat more produced laterally than in T. nudns. 

 The present species inhabits the sea near Hongkong, the Bay of Bengal and the Gulf 



of Siam. 



Dimensions in mm. : 



Fronto-orbital breadth 



Greatest breadth of carapace 



Width of front 



Length of carapace 



Length of dactyli of first pair of walking legs . 

 Length of dactyli of second pair of walking legs 

 Length of dactyli of third pair of walking legs . 

 Length of dactyli of fourth pair of walking legs 



Typhlocarcinops Rathbun. 



1909. Typhlocarcinops Rathbun. Proc. Biol. Soc. Washington, v. 22, p. 112. 



1910. Typhlocarcinops Rathbun. K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. 5, n° 4, p. 345. 



This genus was considered by its author to represent a new subfamily, Typhlocarcinopsinae^ 

 on account of the first abdominal segment of the cf covering the whole width between the last 

 pair of legs. As has been already remarked (p. 199 — 200) I cannot appreciate this character to 

 such a degree as to remove the present genus from the Rhizopinae. Apart from the diagnostic 

 named Typhlocarcinops is extremely alike such genera like Ceratoplax and Typhlocarcinus \ the 

 eyes are sometimes well developed and pigmented, but faint and almost obsolete in other cases. 



i) It is this character that also characterizes a species of Typhlocarcinops (7*. decrescens Rathbun, Proc. U. S. Nat. Mus., v. 48, 

 1914, p. 151)1 which of course is readily recognizable Ijy the first segment of the abdomen entirely occupying the space between the last 

 pair of legs. 



2) It may be added, that this brown colour is also observed on the free margin of the epistome. 



62 



