53 



straight, and both margins are parallel, but the terminal fourth of the inner margin, that is . 

 crenulate throughout, abruptl}- slopes towards the slightly spooned and hairy tip; the movable 

 finger is much curved, broadest at base, and as long as the upper border of the palm, the 

 back of the finger, though generally rounded, is nevertheless slightly carinate and crenulate 

 in the middle, and the proximal three-fourths of the back is enlarged by a peculiar expansion, 

 widening distally and at its broadest part freely projecting, but only present on the outer part 

 of the finger; the outer surface of the latter has an irregular row of very fine granules; the 

 inner margin, like that of the antagonist, is roughly crenulate, but most of the proximal half 

 is occupied by a large prominence, the tip is likewise spooned and hairy. Koelbel already 

 accurately describes the chela, but according to this author, the height of the palm is less in 

 proportion to its length and the inner margin of the dactylus has no large, obtuse prominence, 

 but oniy a triangular tooth, that corresponds with a broad sinus on the opposite margin; most 

 likely individual variations in this respect will be frequently met with. 



The Austrian author calls attention to the peculiar articulation of the cheliped, which 

 articulation, when the limb is extended, causes the chela to be nearly horizontal and not 

 oblique, as is the usual case; even if the cheliped be folded together, the plane of the chela 

 is not vertical but directed obliquely forward from the upper to the lower border, though this 

 is more conspicuous in the left than in the right chela. This articulation is due to the fact, 

 that the inner margin of the wrist is greatly elongated and its distal articulation with the palm 

 is situated rather on the outer surface of the latter (which surface in the outstretched condition 

 of the cheliped becomes the upper or dorsal side) than at the beginning of the superior border. 

 Koelbel's description is to my mind somewhat confu.se, however, and even wrong, for he 

 pretends, that the surface of the palm, that in the folded condition is the outer surface, becomes 

 the inner surface if the limb be outstretched, and the formerly inner surface changes its position 

 so as to become the outer side, so that the fixed finger is lying above the dactylus! Such an 

 extreme contortion does not take place and would be most unnatural. 



The meropodites of all the ambulatory legs are about sYj times as long as broad, as 

 long as the two next joints together, narrowing towards both ends, hairy along the margins, 

 but otherwise unarmed, and provided at both sides with oval tympana, that occupy 

 the greater part of the surface, save in the case of the last pair of legs, where the tympana 

 are only half the lengths of the meropodites. The anterior pair of these legs is the longest, 

 longer than the carapace and equalling the distance between the external orbital angles, 

 distally the legs decrease gradually in length. Both margins of carpo- and propodite are 

 likewise provided with some long hairs. The dactyli are hairy, nearly straight, finely pointed 

 and shorter than the propodites. Between the bases of the first and second, and 

 again between those of the second and third walking leg there is an h a i r }•- 

 edged pouch, as in Sc. globosa. 



The general colour of the animal is a chestnut-brown, lighter on the legs; the chelae are 

 ivory-white. 



This apparently rare species has been originally collected near Hongkong; the "Siboga"' 

 caught it in a river at the Bay of Pidjot (Lombok). 



S3 



