
’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. | 145 


(5—6 in number). The inferior part of the inner surface is covered by 
small granules, of the same shape and size as those of the under margin 
of the palm; this latter is nearly in a straight line with the under 
margin of the immobile finger, along which the granules are continued 
towards the tip. The immobile finger is very high at the base, much 
flattened and minutely pitted at both surfaces; the dactylus is strongly 
curved, equally pitted, but covered along the whole upper surface with 
numerous minute granules. There is no gap between the fingers. 
The meropodites of the walking legs are nat considerably broadened, 
their length in the last pair being about 2'/, their greatest breadth; the 
dactyli are only slightly shorter than the preceding propodites. As de 
Haan observed, both margins of carpo- and propodites and of the dactyli 
are clothed with short, black hairs, intermingled with much longer hairs, 
and this character is more pronounced in the © than in the 9: even 
the under margin of the meropodites show these two kinds of hairs, more 
especially so in the o’, but the hairy coating is gradually reduced from 
the foremost pair of legs to the last, as is usual in Sesarma. 
De Man has, though with some doubt, described a new species S. 
neglecta (Zool. Jahrb. Syst., Bd. 2 1887, p. 661), closely related to the 
present species; we may observe, however, the following differences: 
S. dehaani S. neglecta 
Distance between ex- 
ternal orbital angles 
Lateral margins of ca- 
rapace 
Fore margin of front 
Inner side of palm 
Dimensions: 
nearly exactly equal 
to length of carapace in 
the median line 
parallel in their poste- 
rior two-thirds ') 
with deep and broad 
sinus. 
with transverse row of 
large granules 
Distance between external orbital angles. 
Greatest breadth of carapace . . .. . 
Length of carapace in the median line . 
Breadth of front. . . 
Horizontal leneth of palmie sn = -)) 
distinctly exceeding 
length of carapace in 
the median line 
converging in their pos- 
terior part 
scarcely hollowed out 
without transverse row 
of granules 
1 2 3 
35.— 380.75 27.5 mm. 
SDIo OD rte tia) oe 
3D-— ~d0.25 26.5 —2 
20.— 17.25 15.25 , 
19.— 14.— 12.— 
” 
1) According to de Man the margins are diverging distally in de Haan’s species, but he 
could only consult the figure in the Fauna Japonica and not examine the type specimen itself. 
