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ZOOLOGISCHE MEDEDEELINGEN — DEEL Eeen 
48 
49 
but smooth keel, at the base of which some acute granules are found ; 
at the inner side of this finger a longitudinal row of 9 tubercles 
(especially distinct in <j); inner surface of palm with a transverse 
row of granules. Postfrontal lobes sharpened, and, like the anterior 
margin of the front, denticulate anteriorly. Ses. demani Bürger. 
Upper border of mobile finger of cheliped without a longitudinal 
keel, in adult © regularly transversely milled or provided with a 
row of tubercles. 48 
Sides of carapace very strongly divergent posteriorly ; lateral margin 
of external orbital angle as long as that of anterior epibranchial tooth; 
ocular peduncles short, corneae small. Outer surface of palm of che- 
liped smooth; upper border of movable finger with a longitudinal row 
of 9—10 widely-separated knobs. Walking legs robust, but with much 
elongated carpo- and propodite (save in the first pair); dactyli of two 
last pairs of legs very long and slender, nearly as long as anterior 
(outer) margin of the preceding joints. Species living in subterranean 
rivers at south coast of Java. Ses. jacobsoni thle. 
Sides of carapace much less strongly divergent posteriorly, nearly 
parallel. Upper border of movable finger of cheliped (in adult <) 
with regular transverse grooves. Postfrontal lobes much prominent and 
sharp at anterior margin. 49 
Carapace flattened, smooth, shining. Outer surface of palm of 
cheliped (in adult ©) with a violet hue and a few very large, rounded, 
white tubercles; upper border of movable finger with a longitudinal 
row of 25—30 small, smooth, transverse ribs (in the © the outer 
surface of the palm is light brown, and there are a great many more 
tubercles, that are much smaller; upper border of movable finger with 
some irregular granules). Walking legs robust; dactyli long, scarcely 
shorter than the preceding joints. Ses. atrorubens Hess. 
Carapace more convex, with more distinct regions. Outer surface 
of palm of cheliped with some irregular granules; upper border of 
movable finger in adult ©’ regularly and transversely milled (40—50 
minute grooves), in © smooth. Walking legs slender; propodites much 
elongated; dactyli very slender, though shorter than propodites (in 
the individual variation longitarsis de Man this difference is however 
only very feebly marked). Ses. trapezoidea Guérin. 
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