188 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



lateral tooth is very small. The male postabdominal segments are all of 

 them distinct. The first two joints of the slender antennal peduncle are 

 contained within the large inner orbital hiatus; the epistome is transverse 

 and very short, almost linear; the merus-joint. of the outer maxillipedes 

 is truncated at its distal end and nearly as large as the preceding joint. 

 The chelipedes (for so small a specimen) are well developed and are sub- 

 equal ; merus and carpus are smooth, without spines or tubercles, merus 

 more or less hairy on its inner surface and upper margin ; the palm is but 

 little longer than its greatest vertical depth, which is at the articulation 

 with the mobile finger, smooth and polished, externally, its upper margin 

 not carinated, its inner surface with a dense patch of hair; the lower 

 margin of the immobile finger is in a straight line with the lower margin 

 of the palm, its upper or inner margin is denticulated and has a strong 

 tooth or lobe in the middle; the inner margin of the mobile finger has 

 a smaller tooth near its base; the fingers, when closed, meet only toward 

 their apices, having a hiatus between them, which is hollowed out into 

 a deep, nearly semicircular cavity at the base of the immobile finger ; 

 this cavity is margined with hairs. The ambulatory legs are slender, 

 somewhat compressed and the margins somewhat thinly clothed with hair. 

 Colour, in spirit, brownish. Length of carapace nearly 3 lines (6 mm.), 

 breadth 3^2 lines (somewhat over 7 mm.); length of chelipede about 

 5'/ 2 lines (over 11 mm.)". 



In the figure the external orbital angle has a convex outer margin 

 and does not project farther outward than the anter o-lateral 

 tooth of the carapace, both teeth are of nearly the same shape 

 and size. Besides by this marked character the species is moreover 

 distinguished from the preceding by a much more quadrate carapace, by 

 comparatively longer chelipeds, by the front being one-third of the total 

 breadth of the carapace (one-fourth in M. quadrat us) and by the short 

 eye-stalks, the length of which does not exceed the breadth of the front '). 

 The last feature, together with the shortness of the ischiopodite of the 

 last maxillipeds, which joint nearly equals in length the meropodite of 

 these extremities, very nearly approaches M. punctulatus to Euplax boscii 

 (Audouin). The species of Miers is however more quadrate in outline and 

 in Euplax the sides of the carapace are armed with only 2 teeth in all. 



1) Miers himself gives as differences between his species and M. quadratus, that in the latter 

 species only two lateral teeth in all are present at each side of the carapace, and that there is 

 no tooth on the inner margin of the immobile finger In reality however there are two lateral 

 teeth (besides the external orbital angle) at each side of the carapace in M. qvadraius and the 

 cutting margin of the index is occupied by a very broad, crenulated tooth in the distal half of the 

 finger; this tooth seems only to be better defined towards the tip of the finger in the species of Miers- 



