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I. lyphlocarcinus nndtis Stimpson. PI. 13, Fig. i. 



1858. Typhlocarcinus nudus Stimpson. Proc. Ac. Nat. Sc. Philadelphia, 1858, p. 96. 

 1900. Typhlocarcinus nudus Alcock. Journ. As. Soc. Bengal, v. 69, prt 2, p. 322. 

 1910. Typhlocarcinus nudus Rathbun. K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. 5, n" 4, 

 p. 343, pi. I, f. 6, textfig. 29. 



Stat. 71. Macassar, i cf , 2 9- 



Stat. 174. Waru Bay, north-east coast of Ceram. Depth iS m. i 9 juv. 



The carapace of this species is strongly and regularly curved in a longitudinal direction, 

 nearly straight transversely, and the regions are indistinct : the surface of the front is furnished 

 with a rather long and deep median groove, reaching in the youngest 9 of Stat. 71 even 

 beyond the middle of the carapace; a general gastric region is faintly outlined and defined 

 posteriorly by an interrupted, short cervical groove, at either end of which a conspicuous, 

 curved depression is observed, a cardiac area, broader than the gastric region, is also visible. 

 The whole surface is smooth and glabrous, but the margins, especially the antero-lateral ones, 

 are rather thickly fringed with club-shaped and feathered hairs, and within the reach of these 

 hairs crowded granules occur. 



The carapace is rather broad, the greatest width being 1.6 times its length, and the 

 fronto-orbital breadth occupies nearly one-half of the breadth of the carapace. The front is not 

 quite twice as broad as either orbit, deflexed, with the anterior margin straight and deeply 

 notched in the middle. Orbits high, semi-elliptical, completely filled by the inflated eye-stalks, 

 which show a very faint pigment, shining through the integument, somewhat beyond 

 the middle of the peduncle, but only visible in anterior view of the animal; external orbital 

 angles completely absent. Antero-lateral margins of carapace strongly divergent backward and, 

 at the transition to the parallel postero-lateral ones, separated into three blunt teeth, the median 

 of which is the most conspicuous. Posterior margin convex. 



Antennulae and antennae very small, the peduncle of the latter standing in the very 

 wide inner orbital gap and fused with the median part of the firmly-fixed eye-stalk, the flagellum 

 of the antenna is only i^.. times as long as the width of the orbit. Epistome rather long, 

 vertical, inferior edge entire. Lateral margins of buccal cavity diverging back- 

 ward. External maxillipeds (fig. \d) with the ischium much longer and broader than the sub- 

 quadrate merus, the antero-external angle of which is not produced, subrectangular ; exognath 

 unusually narrow, as Alcock rightly observed, rod-like, and only about one-fourth as 

 broad as the ischium. 



Chelipeds' stout, unequal (at least in the adult cT, in which the left is the larger), smooth 

 and nearly hairless; the only hairs being observed are those along the upper and inner border 

 of the arm, beneath the inner and at the outer anofle of the wrist and alongf the back of the 

 movable finger. Arm unarmed ; inner angle of wrist produced ; palm of smaller chela (in the cf ) 

 as long as, but that at the other side somewhat longer than, the fingers; in the 9 the chelae are 

 nearly equal and apparently smooth in the adult specimen, but in the young individuals the 

 right (smaller) chela is somewhat more hairy than the left ; upper border of palm and under 

 margin of the somewhat deflexed fixed finger sharply keeled, and this inferior keel is continued 



60 



