190 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



general form it resembles somewhat M. convexus, but the carapace is 

 narrower, and the whole surface is granulated, with the exception of the 

 middle parts ; there are no denticulated tubercles on the branchial 

 regions and the carapace is regularly rounded transversely. The upper 

 orbital border is much sloping backward, so that the outer orbital angle 

 is lying behind the level of the convex curve of this upper border ; the outer 

 orbital angle itself is rounded, not at all sharp, and somewhat like that 

 of M. pacifions and M. japonicus. The antero-lateral tooth of the carapace 

 seems scarcely at all defined, anteriorly it is separated from the preceding 

 orbital angle by a distinct incision, but distally there is scarcely an 

 indication of an incision to separate it from a second lateral tooth. Sides 

 of the carapace distinctly convergent posteriorly. 



The palm of the male cheliped is, according to de Man's figure, twice 

 as long as high, slightly granulated, and provided at the outer surface, 

 close to the under margin, with a row of granules that is continued 

 upon the immobile finger. Inner surface of palm and fingers densely 

 hairy. Immobile finger much bent downward, so that the under margin 

 of the palm and that of the said finger form a concave line; the finger 

 is crenulated throughout at the cutting margin, but has no larger tooth. 

 Such a tooth is well represented upon the dactylus, and between the tooth 

 and the tip of the finger there are larger or smaller indentations. 



There are, as far as I am aware, no dimensions published of this 

 species, but according to de Man's figure, M. setosus seems to belong to 

 the middle-sized species, the breadth of the carapace between the outer 

 orbital angles being about 31 mm., the length about 17 mm. The Leiden 

 Museum has no specimen. 



M. pacifions Dana. (PL VIII, Fig. 11) 



1851. M. pacifiais Dana. Proc. Ac, Nat. Sc. Philadelphia, 1851, p. 248 



(Upolu, Samoa). 



1852. „ pacifiais Dana. U. S. Expl. Exp., Crust., prt. 1 p. 314, pi. 19 



f. 4 (same record). 

 1858. „ pacifiais Stimpson. Proc. Ac. Nat. Sc. Philadelphia, v. 10 p. 97 



(Loo-Choo-isles). 

 1868. „ bicarinatus? Heller. Crust. „No vara" Reise, p. 36, pi. 4 f . 2 



(Nicobars). 

 1890. „ pacifiais de Man. Notes Leyden Museum, v. 12, p. 79, pi. 4 



fig. 10 (locality unknown). 

 1895. „ pacifiais de Man. Zool. Jahrb. Abt. Syst., Bnd. 8 p. 579 <Pe- 



nang and Pontianak). 



