192 Z OOLOGISCHE MEDEDEELINGEN — DEEL I. 



to has been created; the lines are on the contrary partly represented in 

 Heller's figure of M. bicarinatus. ') 



The palm of the male cheliped is peculiar in having no ridge what- 

 ever close to the under margin, in being smooth to the naked eye, and 

 in the inner surface being unarmed and naked ; there are only hairs 

 near the insertion of the fingers and at the inner surface of the latter. 

 Both fingers have horny, excavated, spoon-like tips ; the dactylus has 

 a large, quadrangular tooth somewhat before the middle, the immobile 

 finger on the contrary has no larger tooth, but is crenulated throughout, 

 is in a line with the under margin of the palm and shows a faint ridge 

 at the outside. Contrary to the usual case in the genus, the ambulatory 

 legs are only slightly hairy, even the posterior legs have only few, 

 short hairs along the margin. It seems to have been overlooked by de 

 Man, that (in my specimens at least) the hinder legs have a small 

 spine at the anterior margin of the meropodite, near its distal end, 

 quite as occurs in the preceding legs, and this character the species 

 shares, as far as I know, only with very few of its congeners (M. la- 

 treillei, M. dentatus (?)). 



The dimensions of two of the Museum specimens (1 cf , 3 Ç) have 

 been given by de Man (1890, p. 82 — 83); one of these, the largest female, 

 was again and more fully measured by the same author on another occasion 

 (1902, p. 498). 



M. crinitus Rathbun. 



1902. M. sp. de Man. Abhandl. Senckenb. Gesellsch., Bnd 25 p. 495 



(Halmaheira). 

 1910. „ pacificus Rathbun (nee Dana). Bull. Mus. comp. Zool. Harvard 



Coll., Cambridge, Mass., v. 52 p. 307, pi. 1 f . 3 (Amboyna). 

 1913. „ crinitus Rathbun. Proc. U. S. Nat. Mus., v. 44 p. 619, pi. 75 



f. 3 (same record). 



This species is most closely allied to the preceding one, so that at 

 first sight it was confounded with the latter by Miss Rathbun, but it 

 cannot be denied that it bears even a greater resemblance to Euplax 

 boscii (Audouin). 



The carapace is nearly wholly subquadrate, its breadth only slightly 

 exceeding the length ; it is convex, evenly rounded above, smooth in the 

 middle parts and irregularly granulate towards the sides, but here the 



1) This figure, as de Man observes, is probably wrong in presenting the carapace much nar- 

 rower than it really is, and there is a remarkable contradiction between Heller's figure and text, 

 as regards the dimensions of his species (see also de Man, 1902, p. 495). 



