186 ZOOLOGISCHE MEDEDEELINGEN — DEEL 1. 



the same margin of the outer orbital angle, and the curved side margin 

 presents three or four distinct indentations. The second lateral tooth is 

 very small, separated from the preceding by a distinct incision and pre- 

 senting at the side margin likewise some four indentations. Behind the 

 teeth the sides of the carapace are distinctly convergent. On the bran- 

 chial regions there is no trace of longitudinal granulated rows. The 

 upper border of the orbital groove is finely crenulated, the crenulations 

 being more conspicuous in the outer half of the border and continued 

 upon the fore margin of the external angle. The inferior orbital margin 

 is regularly crenulated in the female, but in the male it presents three 

 large, obtuse lobules in its outer half, with the tips directed inward ; 

 between the inner tubercle and the epistome there is a short row of 

 7 — 8 extremely minute denticles. 



Like M. erato the three-faced arm of the cheliped bears a „musical 

 crest", about at the same place, viz. in the middle of the inner margin, 

 and parallel to this margin '). The carpus presents some sharp granules 

 at the inner angle of the anterior side. The palm is inflated and very 

 short, its height at the insertion of the dactylus being not much less 

 than, the length (index excluded) ; inner surface densely hairy, but there 

 is no spine near the carpal end, as in M. erato. Parallel with the supe- 

 rior border of the palm and close to it runs an inconspicuous ridge, 

 which, like the border itself, is minutely granular; the whole outer sur- 

 face proves to be somewhat granulated, when examined with rather 

 strong magnifying power, but appears smooth to the naked eye. The 

 fingers are short, much more so than the palm, and there is a wide 

 space between their bases, the fingers meeting only at the tips, which 

 are horny, excavated, spoon-like as in M. erato, and show a few short, 

 yellow hairs at the inner border. The immobile finger has a faint lon- 

 gitudinal ridge at its outside, this ridge is not so easily visible as in 

 M. erato ; the cutting margin is occupied in its whole second half by a 

 very long crenulated tooth, continued to the tip of the finger, the first 

 half of the index being unarmed. The dactylus bears a distinct, rectan- 

 gular tooth not far from the base; between this tooth and the tip of the 

 finger the cutting margin shows several indentations. In the shape of the 

 palm there is very much resemblance with M. erato (see de Man, Journ. 

 Linn. Soc. London, v. 22, 1888, pi. 8 f. 14), but as this author pointed 

 out, the palm is somewhat higher and comparatively shorter in M. qua- 

 dratus. The ambulatory legs again agree with those of M. erato in having 



1) In my only <ƒ of 31. erato the crest forms a certain angle with the margin and the 

 same has been observed by Alcock (see p. 180). 



