338 



A HISTORY OF EECENT CRUSTACEA 



ings of many of them that excite some surprise by the vivid- 

 ness of the colouring. His Gnathia asdaferus has ' man- 

 dibles ' of unusual shape, 

 their axe-like appearance 

 being alluded to in the 

 specific name. GnatJtia 

 stygius (Sars) is more than 

 half an inch long. 



Euneogriaihia may be 

 instituted as a new genus 

 to receive the species 

 Anceus gigos, Beddard, 

 from Kerguelen. It is 

 strikingly distinguished 

 from Gnatliia by having 

 the first gnathopods in the 

 male six-jointed. Thepleo- 

 pods have both branches 

 fringed with long plumose 

 hairs. The male of Euneo- 

 gnathia gigas (see Plate 

 XIV.) exceeds three-fifths 

 of an inch in length, and 

 is therefore the largest known member of the family. The 

 fourth and fifth segments of the perseon are markedly the 

 widest. 



Anceus bcdhyhius, Beddard, dredged from a depth of 

 900 fathoms, will no doubt require to be transferred to 

 another new genus, but the species, being founded on a 

 fragment of a specimen, may wait for a new generic name 

 till fuller material is obtained. 



A7iceus DanieUi, Hesse, 1884, may also represent a dis- 

 tinct genus, and probably, whenever the family is mono- 

 graphed, it will develop as plentiful a harvest of genera as 

 its neighbours. 



Fig. Z0.—CT7iathi(i ascinferm (Hesse), 

 the male [Hesse], 



