's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 195 



and not larger than the surrounding granules on the carapace. Secondly 

 there is a transverse row, apparently proceeding from the second lateral 

 tooth, and finally we may observe an oblique row just above the insertion 

 of the posterior legs. All the borders of the carapace are crenulated or 

 finely beaded. The upper border of the orbit is elegantly curved, straight ; 

 the inferior border projects much more forward, is convex and much 

 more Conspicuously crenulated than the upper border ; in the male the 

 outer fourth of the under orbital border is occupied by three rounded 

 tubercles, with the tips directed inward, which formation, as usual, is 

 associated with the presence of a „musical crest". Front narrow, deeply 

 grooved in the middle, much constricted between the eye-stalks ; the 

 latter are straight, stoutish and do not reach to the external orbital angle. 



The chelipeds of the only male specimen in the Museum are, unlike 

 the usual case in this genus, unequal, the right being the larger. x ) Upper 

 and inner border of the arm furnished with long hairs, inner surface of 

 the arm with a short horny „musical crest", running close to and pa- 

 rallel with the inner margin of the arm, and lying in the beginning of 

 the distal half of the latter. Wrist armed with a row of tubercles along 

 the inner margin and some spines at the anterior border, near the palm. 

 Palm rather low, not increasing much in height towards the distal end, 

 outer surface smooth, without ridge near the under margin, somewhat 

 granular towards the superior border. Fingers about as long as the palm, 

 with horny, excavated, spoon-like tips, densely clothed with hair at these 

 tips, but the inner surface of the fingers as well as that of the palm is 

 nearly naked. 2 ) This last character the species shares with M. japonicus. 

 The cutting margin of both fingers are armed with a large tooth, that 

 on the dactylus being narrow, rectangular and placed near the base, that 

 on the index being larger and higher, sloping backward ; between the 

 tooth and the tip both fingers are minutely denticulate. The ambulatory 

 legs have strong and thick meropodites, which in the first to third pair 

 are armed with a spine at the fore margin and densely clothed with hairs 

 at the upper surface; these hairs are also visible on the carpus and the 

 proximal half of the propodite in the middle pairs of legs. Nails very 

 much compressed and broad, hairy at the margins. 



The only specimen of the Museum (tf) is one of those, described by 

 de Man, from the Mergui archipelago ; it has been measured by this 

 author already (p. 124). 



1) De Mao states that the chelipeds in the adult specimens are „nearly equal to one another". 



2) De Man observed at the inner surface of the palm „a clos>e down of hairs", but in adult 

 specimens these hairs are, according to the author, „nearly wanting:, being probably worn off, so 

 that the inner surface of the palm appears glabrous". 



