Dimensions: 1 5 . 
Distance between external orbital angles. . . . . . . 165 19.5 14.5 
Length of carapace. . . yeh mo NL 110.05 19,2 2875 
Breadth of front (at upper ae pee ope meio 0 rsh Op aL 2D 9.5 
eters Of carapace. de vee ar ea de ee 8.25 9.5, 7.— 
Beemen th o£ palm. RU. a ee Del 9.5,, Be 
ent of Te NE 5.5 6.5, 3.5 
es no moyable Anser... et ee eer 26.25. 7— 3.15 
Length of meropodite = | 14.— 9.75 
Breadth , jk of penultimate | 5.25 4,— 
Length „ carpo- + propodite | pair of legs More 
x „ dactylus 7 — — 1) 4.5 
Posterior margin of 5th (antepenultimate) segment of abdomen 5.751 — — 
Length of 5th (antepenultimate) segment of abdomen 1.90} — — 
Posterior margin of 6th (penultimate) segment of abdomen 4.90|, — — 
Length of 6th (penultimate) segment of abdomen 1.85 hie — 
Base of last segment of abdomen 2.39| — — 
Length of last segment of abdomen 2.66/ — — 
’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 227 
in a regular way (in the single © of Cl. merguiense small patches of hairs 
are observed on the anterior part of the carapace, much more numerous 
and rather irregularly disposed), by the lateral postfrontal lobes being 
subdivided, by longer propodites and shorter dactyli of the walking legs, 
and by some differences in the abdomen of the /. From the species of 
Milne-Edwards it is equally distinguished by the latter character, by the 
regular curve of the upper orbital border, being not convex in its inner 
half, and by the same differences in regard to the walking legs. 
N°. 1 and 2 are „Siboga” specimens from the Talaut Archipelago (n°. 2 is 
adult, with numerous, small ovae beneath the abdomen), n°. 3 is from Nias. 
IT. Habits and Distribution. 
The few and scanty notes scattered about in the literature concerning 
the habits of the species we are here dealing with, indicate that the latter 
in the vast majority inhabit mangrove swamps, mouths of rivers and 
brooks and are even normally found in fresh water, far from the sea and 
high up into the country. Though not bound so strictly to fresh water 
as the true river. crabs (Potamonidae), they nevertheless ascend rivers 
and brooks, may leave the water and wander about on land, where many 
1) Absent in the specimen. 2) Measured under the microscope. 
