194 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



1852. M. tomentosus H. Milne-Edwards. Ann. Sc. nat., sér. 3, Zool., t. 18 



p. 159 (no new record). 

 1873. „ tomentosus A. Milne-Edwards. Xouv. Arch. Mus. d'Hist. nat. 



Paris, t. 9 p. 279 (New Caledonia and Aroe-isles). 

 1888. „ tomentosus de Man. Journ. Linn. Soc. London, v. 22 p. 122 



(Mergui Archipelago). 

 1900. „ tomentosus Alcock. Journ. As. Soc. Bengal, v. 69, prt. 2, p. 382 



(same record as that of de Man). 



Though at first sight this species is much like M. japonicus and 

 M. depressus, as de Man observed, it may be easily distinguished by the 

 carapace being considerably narrowed anteriorly (so that the external 

 orbital angle, which is very much rounded off, projects less outward 

 than the first lateral tooth), by the finer granulation of the carapace and 

 the hairiness of the meropodites of the walking legs. 



De Man has furnished us with a full description of this species. The 

 greatest breadth of the carapace is found between the tips of the postero- 

 lateral teeth, behind which the sides are parallel or even slightly bul- 

 ging. ') The outer orbital angle is rectangular and very large, the side 

 margins of the angles diverging towards the incision which separates the 

 first lateral tooth anteriorly. This latter tooth projects farther outward 

 and has a convex lateral margin, which passes nearly without incision 

 into the very small second lateral tooth, situated (in my specimen at 

 least) a little way before the middle of the lateral margin of the cara- 

 pace. 2 ) The granulation of the carapace, though very distinct, is repre- 

 sented perhaps somewhat too coarse in my figure ; the granules are 

 especially crowded on the branchial regions, but the middle parts of the 

 carapace (the nasogastric and the median part of the anterior cardiac 

 area) are smooth. Towards the postero-lateral sides we may observe the 

 same arrangement of granulated rows as has been mentioned (in the 

 shape of pubescent lines) in M. pacificus. Firstly there are at each side 

 two obliquely-longitudinal hairy rows, composed of closely set granules 

 that are larger than those on the rest of the carapace; in M. japonicus 

 the granules composing these rows are fewer in number, more scattered 



1) In Souleyet's figure the sides of the carapace in the posterior part are very irregular, 

 presenting some conspicuous prominences. To judge from my specimen the carapace is somewhat 

 broadened behind the small second lateral teeth, with a regular, convex outline, but details are 

 obscured by the rather thick hairy coating of the surface. 



2) De Man mentions three (not two) incisions; the posterior incision, situated behind the 

 middle of the lateral margin, is very indistinct and may easily be overlooked. I have not found 

 it in my specimen. 



