's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 193 



surface is everywhere covered by hairs. Like the preceding species the 

 carapace is narrowed anteriorly and attains its greatest breadth at the 

 poster o-lateral teeth. The external orbital angle and the lateral teeth seem 

 to offer no marked difference with those of M. pact ficus '). The upper 

 orbital border appears to be slightly more sinuous. There is no trace of 

 longitudinal pubescent lines on the postero-lateral sides of the carapace, 

 but above the insertion of the posterior legs there is a similar short, 

 curved line as in the preceding species. 



The cheliped of the male, except for its being densely clothed with 

 hairs along nearly the whole inner face, is again very much like that 

 of M. pacificus, but the granulation on the wrist and on the outer surface 

 of the palm seems to be somewhat coarser. The dactylus has the same, 

 large, conspicuous, quadrangular tooth at the middle of its length. 



The ambulatory legs of M. crinitus are, like the carapace, densely 

 covered with hairs; mero-, carpo- and propodite of the penultimate pair of 

 legs are comparatively longer than in M. pacificus (see de Man, p. 498); 

 the first to third pair of walking legs bear a small spine at the anterior 

 margin of their meropodites, near the carpal end, but the spine is concealed 

 by the thick hairy covering of these joints. 



M. crinitus, as has been remarked above, is nearly related to Euplax 

 boscii (Audouin), but in Euplax the sides of the carapace are armed with 

 only two teeth in all, the meropodite of the third pair of maxillipeds is 

 nearly as long as the preceding joint, these maxillipeds themselves leave 

 a wide gap between them, and the outer margins of the external orbital 

 angles are convergent posteriorly, whereas in the present species of Ma- 

 crophthalmus there are three teeth in all at the sides of the carapace 

 (external orbital angle included), the meropodite of the third pair of 

 maxillipeds is shorter than the preceding joint, the maxillipeds have only 

 a narrow gap between them, and the outer margins of the external orbital 

 angles are divergent posteriorly or parallel. 



The species is not represented in the collection of the Leiden Museum. 



The length of the carapace of a type male specimen, measured by 

 Miss Rathbun, is 11.2 mm., the breadth 15.3 mm., the width of the front 

 below 2.5 mm. 



M. tomentosus Souleyet. (PL IX, Fig. 12). 



1841. M. tomentosus Souleyet. Voy. „Bonite", Zool., t. 1 p. 243, Crust., 

 pi. 3 f . 8 (Manilla, Philippines). 



1) According to de Man (p. 497) the outer orbital angle is distinctly sharper in the 

 present species. 



