igS STALK-EYED CRUSTACEA 



I. Portunus guadulpensis. 



Portunus guadulpensis . Saussure, A. Milne Edwards. 



Carapace convex and long ; regions scarcely indicated. 

 Antero-lateral edges cut into five sharp spines. Front has 

 five teeth, of which the two external are rudimentary, the 

 other equally advanced ; the middle one is sharp, the 

 intermediate ones more rounded. Of the legs of the first 

 pair, the fourth joint is short and smooth ; the fifth has a 

 single spine at its antero-internal angle. Hands strongly 

 keeled, having a small spine above the base of the movable 

 finger ; the other legs are thin. 



Range. — Guadaloupc. 



2. Platyonychus. 



Platyonyclnis . Latreille, Milne Edwards, Miers. 

 Ants opus . . . De Haan. 



Carapace depressed and transverse ; the dorsal surface 

 without tubercles or transverse ridges ; the front is rather 

 narrow, and armed with three or four lobes or teeth ; the 

 antero-lateral margins arcuated, and armed with five teeth 

 or spines, including the lobe at the exterior orbital angle 

 and the lateral epibranchial tooth, which is no longer than 

 the preceding tooth. 



The eyes are of moderate length. The orbits are 

 rather widely open above, and have one or two fissures 

 in the superior and one in the inferior margin. The 

 ridges of the endostome are obsolete. The basal joint of 

 the external antennae is short, not dilated, and occupies 

 but does not wholly fill the interior hiatus of the orbit, 

 and is not united at its distal extremity with the front. 

 The external maxillipedes are rather large ; the third 



