's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 201 



lateral tooth very high, with obtuse tip, second tooth very small, though 

 distinct. Front narrow, constricted, bilobed at the free margin, very 

 deeply furrowed, a rounded group of granules on each epigastric lobe 

 (where there is a concave series of such granules in M. definitus). Upper 

 orbital border with a deep curve, so that the inner curve near the base 

 of the front is at about the same level as the outer orbital angle ; the 

 border itself is strongly crenulate, more so than in other species of the 

 genus (except M. pectinipes)\ inferior orbital border nearly straight 

 throughout four-fifths of its length and strongly dentate, the outer fifth 

 part abruptly sloping. Ocular peduncles slender, eyes reaching nearly to 

 the end of the orbit, but not surpassing it. Grooves on the carapace 

 very conspicuous and broad, the grooves circumscribing the gastric area 

 very deep, the lateral transverse ones somewhat sigmoid-shaped, especially 

 the hinder groove, clothed with short hairs. 



Chelipeds of the male, as de Haan rightly observed, short or long, 

 according to age ; in young specimens scarcely as long as the breadth 

 of the carapace, in the adult twice as long. Arm slender, with a bunch 

 of hairs at the under surface and a row of hairs at the upper border. 

 Palm elongated, slightly granular at the outer surface; inner surface 

 naked, without hairs, but wholly covered with granules, the larger ones 

 being found towards the carpal end and there is a longitudinal row of 

 granules not far from the upper border ; the latter finely crenulate and a 

 parallel row of granules immediately behind it, in the proximal half of 

 the palm. Mobile finger much curved, granular, especially at the upper 

 border, cutting margin with a distinct large, quadrangular tooth near the 

 base, between the tooth and the tip of the fingers a series of fine den- 

 tations. Index likewise granular, much curved downward, so that it forms 

 a concave line with the inferior border of the palm, some few hairs near 

 the tip at the inner surface, cutting margin provided with a large, sloping 

 tooth and for the rest crenulate towards the tip of the finger. 



Meropodites of walking legs broad, though not narrowed towards the 

 distal end (as in M. depressus), armed with a spine at the fore margin 

 in the case of the first to third pairs of legs, and hairy along this margin, 

 but not at the upper and under surface, as is so conspicuously pro- 

 nounced in M. depressus. Both margins of the meropodites are strongly 

 serrate. Nails lanceolate, very broad, hairy at the margins. 



The Leiden Museum contains a great many specimens, all from 

 Japan and apparently collected by Burger and v. Siebold. Only two 

 (c? and 9) were preserved in alcohol, the rest (23 <ƒ, 11 9) were all 

 dried up ; among them I recognized the type male of de Haan, figured 

 by him on pi. 15 f. 2. 



