168 ZOOLOGISCHE MEDEDEELINGEN — DEEL IV. 



more vaulted in Pyxidognathus, the front is deflexed and the chelae 

 are hairless. 



1. Pyxidognathus granulosus A. Milne-Edwards (PI. XI, Fig. 2). 

 As already said, I examined the type specimen of Hypsilograpsus deldeni 

 de Man, of which this author in 1879 published a very good description. 

 It seems useless to redescribe it at length, but, as the species has never 

 been figured, I give a drawing, and shall indicate some characters, that 

 may distinguish the species from the next. 



The carapace is very much vaulted in both directions, so that in front 

 view it appears almost semi-globular (f. 2 a). The maximum breadth is 

 found between the tips of the posterior lateral teeth, and exceeds some- 

 what the length of the carapace. The distance between the external orbital 

 angles is about 79°/ of the greatest breadth of the carapace; the orbital 

 angles themselves are subacute, and the lateral borders distinctly diverge 

 backward towards the anterior epibranchial teeth, the tip of which is 

 obtuse, little projecting and lying midway between the external orbital 

 angle and the tip of the posterior epibranchial tooth, that is equally shaped; 

 behind these latter teeth, at the end of the anterior third of the lateral 

 border, these borders distinctly converge backwards towards the bases of 

 the last pair of legs. The posterior margin of the carapace slightly exceeds 

 the distance between the anterior lateral angles of the front. This latter 

 is not marked off posteriorly from the protogastric region, as it keeps 

 the same regular convex curve of the carapace, the anterior margin has 

 three wide sinuses, one median and two, somewhat narrower and deeper, 

 lateral, which latter are bordered externally by the lateral angles of the 

 front, that are projecting and subacute "(f. 2a). The infra-orbital border 

 is straight and has a small erect tooth at the median end, which tooth 

 reaches upward to the same level as the tip of the lateral angle of the 

 front, but is placed somewhat externally with regard to this angle, so 

 that a small hiatus is left for the antenna, that enters the orbit. The 

 anterior border of the buccal cavity is projecting. The whole outline of 

 the carapace, including the borders of the nearly circular orbits, a hori- 

 zontal line immediately beneath these and the anterior border of the 

 buccal cavern is granulated; moreover the whole upper surface of the 

 carapace is likewise covered with granules. This granulation is especially 

 marked on the hepatic and branchial regions, where the granules are 

 largest, they are more crowded and smaller on the protogastric region, 

 where two median postfrontal lobes, separated by a broad and shallow, 

 smooth furrow, and two lateral lobes, situated much farther behind, are 

 distinguishable (f. 2«); on the front there are four groups of granules, 



