144 ZOOLOGISCHE MEDEDEELINGEN — DEEL II. 

chial tooth behind the external orbital angle; the latter is directed 
straightly forward and the upper orbital border is deeply concave. The 
whole surface of the carapace is entirely destitute of hairs and pitted; 
these pits assume the shape of fine transverse lines on the mesogastric 
and anterior cardiac regions. Al the usual grooves and furrows are dis- 
tinctly pronounced; the postfrontal lobes sharply defined, the inner ones 
separated by a very deep furrow, into which the triangular lobe of the 
mesogastric area extends far forward; the outer postfrontal lobes are 
scarcely narrower than the inner ones, separated from the latter by a 
shallow, short furrow, and furnished at the level of the upper orbital 
border with a distinct additional lobe. The front is bent perpendicularly 
downward, its lateral sides are straight and the fore margin projects 
largely forward, so that the two broad lobes at either side of the deep, 
but broad sinus are clearly seen, if the carapace is looked at from above ; 
the middle part of the sinus is straight, not concave. 
The abdomen of the <j has been well figured by de Haan: it is rather 
broad, gradually narrowing towards the last segment, the penultimate 
segment being exactly twice at broad at the posterior margin as long. 
The chelipeds are of equal size and very robust and bulky in the oc. 
The anterior and posterior margin of the meropodite are coarsely dentate, 
more so in the case of the anterior margin, which is scarcely expanded 
in its anterior half and does not show a larger tooth; the superior mar- 
gin has at the subdistal end a rectangular projection, but no acute, curved 
tooth. The wrist is transversely rugose at the upper surface, with ob- 
tusely-angled inner margin; at the under side, near the palmar joint, 
there is a transverse row of 3—4 acute spines, the inner of which is 
the larger; in some cases it is only this inner spine which is developed. 
The palm is very high, as high as long (without the fingers) and much 
inflated, covered at the outer surface, especially in its upper half, with 
larger, rounded tubercles, in the middle there is an indistinct obliquely 
transverse row, which is however not always developed, and beneath the 
anterior end of this row we observe a rather well defined group 
of very large tubercles, in the same way as in de Haan’s S. in- 
termedia (Faun. Jap., pl. 16 f. 5). De Haan himself does not describe 
or figure this peculiar group of tubercles, which seems to me a charac- 
teristic feature of the species. In the female this group is entirely wanting. 
The upper margin of the palm is formed by a broken line of fine gra- 
nules, from which some very short, oblique lines run forward; one of 
these lines is composed of larger granules and much longer, it bends 
perpendicularly downward at its anterior end and is continued along the 
inner surface of the palm as a transverse row of very large tubercles 
