232 



DISCOVERY REPORTS 



rather short, 5th triangular, 6th a little wider and much longer than 5th, oblong, palm 



transverse, divided into two portions by a 



step, the lower portion minutely crenulate 



or castellate, defining angle rounded, finger 



equal to palm, inner margin minutely 



crenulate; in ? similar but weaker. 



Peraeopod 3 , 2nd joint broadly expanded, 

 anterior margin strongly convex. Peraeo- 

 pods 4 and 5, 2nd joint pyriform, narrower 

 in peraeopod 4 than in 5. 



Colour (as preserved), white with greyish 

 mottling, eyes black. 



Remarks. This little species approaches 

 Megamphopus in the reduced accessory Fig. 145. Eurystheus ewypodii, n.sp. a. Gnathopod 

 flagellum,butisatypical£ttry^«"inthe 2 ^ with palm and finger further enlarged, b. and 



... , , 1 1 rni joint of peraeopod 3. 



epistomial spine and 2nd gnathopod . 1 here 



is no doubt that this is the same species which Monod partly figured. The Belgica 

 specimens were also taken on the carapace of Eurypodius. 



Distribution. Magellan Strait. 



Genus Megamphopus, Norm. 



Stebbing, 1906, p. 621. 

 Chevreux and Fage, 1925, p. 318. 

 Schellenberg, 1925, p. 182. 



It is a little difficult to define the exact differences between Eurystheus and this genus. 

 The epistomial spine is characteristic of many species of Enrystheus, though apparently 

 not so strongly developed in the type species, maculatus, as in other species. It is not 

 developed at all in Megamphopus. The accessory fiagellum of antenna 1 in Eurystheus 

 is usually multiarticulate (four to ten joints), but in palmatus is reduced to two 

 to three joints, and forms a transition to Megamphopus where it has only a single 



joint. 



In the species of Eurystheus the 5th joint of gnathopod 2 in the 6* shows all stages 

 from the triangular or cup-shaped form to the elongate form where the joint is as long 

 as or even longer than the 6th joint, thus also connecting with Megamphopus. The hand 

 of gnathopod 2 in the 6* is, however, usually strong in Eurystheus, and the palm always 

 better developed than in Megamphopus. 



The species described below is placed in Megamphopus on account of the reduced 

 accessory fiagellum, the absence of an epistomial spine, and the feebly developed palm 

 of gnathopod 2 in the <?. 



Two species of this genus are known, one from Northern Europe, the other from the 

 coast of Algeria. 



