’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 161 
vertically deflexed, but free margin projecting and with a very deep and 
rather narrow median sinus; the lateral margins of the front are concave 
and pass with a sharp angle into the anterior margin. Chelipeds very 
massive; upper border of arm with a sharp, curved, subdistal tooth, an- 
terior margin scarcely expanded in its distal half and, like the posterior 
border, coarsely serrate. Carpopodite rugose at the upper surface, with 
sharply produced inner angle; between this angle and the palmar 
joint, the anterior margin is provided with a row of 7—8 teeth. Palm 
much inflated and very high in the ©; upper margin marked, at least 
in the proximal half by a longitudinal row of granules, which is dis- 
solved anteriorly into some subparallel, much smaller, but similar, rows 
and ends, above the base of the mobile finger, with an acute spine; 
outer surface longitudinally wrinkled (in old specimens) or granular, 
especially in the inferior half; under margin much rounded off; inner 
surface with irregularly-placed, large granules. Fingers somewhat longer 
than the palm, immobile finger with horny-coloured denticles along its 
whole inferior border, flattened at the sides, that are perfectly smooth 
(with a few pits at the outer surface). The cutting margins of both 
fingers present in young specimens the usual denticles of different size, 
but with advancing age these seem to become obliterated, until in large 
specimens they have almost completely disappeared. The mobile finger, 
_ as both de Man and Nobili remarked, is strongly curved in the adult 9, 
but in young specimens, and in the © always, the finger presents only 
a feeble arch; the back has a row of 11—14 acute tubercles with 
horny tips and directed forward, they extend to the tip of the finger, 
but are somewhat irregularly distributed, notably more closely together 
near the tip and accompanied by smaller granules at the inner side of the 
base; this character again becomes indistinct with advancing age; outer 
and inner surface of the mobile finger are smooth, minutely pitted. 
Walking legs short; meropodites rather slender, more than twice as 
long as broad; propodite covered at both margins with a short and close 
fur, which, however, scarcely extends to the carpopodite, not even in 
the first pair of walking legs. Dactyli long, strongly curved and pointed, 
with horny tips, as long as their respective propodites. 
Abdomen of © broad; posterior margin of penultimate segment some- 
what more than twice the length of this segment. 
Dimensions of 2 © from Nias: 
1 2 
Distance between external orbital angles . . . . 36.75 37.75 mm. 
Greatest breadth of carapace (at level of posterior 
euibranebial, teeth) ie) ak oe) venten a A 2 188-0 41.— 
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