's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIBEN. 159 



of by Milne-Edwards), the tip of which is surmounted by a white- 

 coloured large granule; the foremost of these tubercles is situated just 

 before the lateral end of the second transverse lateral groove of the 

 carapace and is somewhat elongated transversely, the other tubercles are 

 lying farther behind on the branchial regions. On the slopes of the carapace 

 there is among the minute granules another longitudinal row of somewhat 

 larger granules. The grooves separating the various regions of the carapace 

 are very inconspicuous, the most distinct ones are those bordering the meso- 

 gastric area, the transverse grooves) on the hepatical regions are very shallow 

 and between these grooves the carapace is raised towards the margins into a 

 series of very obtuse, ill-defined knobs. At either side of the median line 

 of the carapace, just before the transverse groove separating the gastric 

 and the cardiac area, we may remark a very short, straight, well marked 

 line, which on microscopic examination proves to consist of a shallow 

 groove, immediately before which a series of minute hairs is inserted. 



In the male specimen from Padang the carapace is exactly alike, 

 except for the marked difference that the whole surface is covered 

 with closely set granules and is not smooth and glossy as in the 

 females. I have no more specimens and cannot make out whether this 

 difference is a sexual one ; perhaps, however, my female specimens repre- 

 sent a local variety of the species. 



The front is narrow, constricted between the eye-stalks, faintly bilobed 

 at its free margin and nearly perpendicularly bent downward. The ocular 

 peduncles are very long, though not so as in the following species. Ac- 

 cording to Milne-Edwards (1852) they project beyond the outer orbital 

 angle for the length of the eye only l ), but in my female specimens the 

 peduncles are more elongated and project beyond the carapace for about 

 one-fourth of the length of the whole eye-stalk. In the male specimen 

 the ocular peduncles are most unfortunately much damaged and the eyes 

 themselves are torn away. The upper orbital border is faintly convex, 

 serrated, especially along its outer half; the under margin of the orbital 

 groove projects much forward and is beset with minute denticles, curved 

 inward, but the margin disappears laterally at a distance of about one-third 

 of the whole length of the upper orbital border. 



The abdomen of the females is extremely broad, nearly semicircular, and 

 the sutures between the anterior joints are peculiarly wavy, not straight. 



1) The same character occurs in a very young female specimen from the Harafoera Sea, men- 

 tioned by Miers (Rep. Brachyura „Ohal!enger"-Ejp. p. 249) and referred by him doubtfully to 

 M. podophthalmus (= M. telescopicus), but the length of the carapace in proportion to its 

 greatest breadth prevents its being regarded as the species now under discussion (length of cara- 

 pace 4 mm., breadth 5.5 mm.). 



