950 THE HON, P. A. METHUEN ON 



It may be as well to record the outstanding characters of this 

 new species in order, and mention points of similarity and dif- 

 ference between it and the various genera and species mentioned 

 above, as they appear significant in leading us to some conclusion 

 as to the proper systematic position of the only known fresh- water 

 Amphipod from South Africa (unless some littoral marine forms, 

 taken in a stream in the Cape Peninsula and in vleis on the Cape 

 Flats within two or three miles of the sea, be considered as true 

 freshwater creatures). 



The antennules are longer than the antenna?, the accessory 

 flagellum small and 2-jointed, subequal to the first joint of the 

 normal flagellum. In Eucrangonyx vejdovskyi^ the second joint 

 of the accessory flagellum is half the length of the first. In 

 Neonijjhargus, the accessory flagellum is 2-jointed, longer or 

 shorter than first flagellular joint. 



Upper lip rounded as in Kijjhargus, Crangonyx, etc. 

 Lower lip, inner lobes fairly small ; in Paracrangonyx they are 

 small ; in Ni'phargus well developed ; in Crangonyx jiagellula 

 Benedict, very small. Mandibular processes moderate ; in Eucran- 

 gonyx vejdovskyi unusually prolonged. 



Mandibles normal, dissimilar. Second joint of palp, subequal 

 to third, is rather broad owing to convexity of inner margin ; in 

 Eucrangonyx vejdovskyi second joint broad, considerably longer 

 than third ; in Paracrangonyx third joint subequal to second, 

 which is not expanded (in figure) ; in Niphargus third joint longer 

 than second. 



Maxillula : inner plate with two plumose setfe, outer with seven 

 spines serrated on the inner side ; two or three seta? to inner 

 plate in Niphargus and Neoniphargiis^ the former with seven 

 spines to the inner plate, the latter with six ; in Paracrangonyx 

 the same as for Eucrangonyx rohertsi ; inner plate of Crangoiiyx 

 with six setae, of Eucrangonyx vejdovskyi with four seta?. 

 Maxilla as in Eucrangonyx. 



Maxillipeds as in Eucrangonyx (most probably), not unlike 

 those in Paracrangonyx. 



The two j)airs of gnathopods as in Eucrangonyx vejdovskyi, but 

 palm equal to hind margin ; in E. vejdovskyi it is much shorter. 



Pereiopods 1 and 2 slender and slightly shorter than succeed- 

 ing pereiopods ; in E. vejdovskyi they are " said to be slightly 

 longer." Pereiopod 5 the longest. The second joints of all the 

 pereiopods much as in E. vejdovskyi. 



Pleopods normal ; in Paracrangonyx slight and one-branched. 

 In uropod 1 , peduncle a little longer than the equal rami ; in 

 E. vejdovskyi as long. 



In uropod 2, rami slightly unequal, peduncle as long as shortest 

 ramus ; in E. vejdovskyi shorter than rami. 



Uropod 3 has peduncle half the length of long outer ramus, 

 inner ramvis minute with single spine ; in E. vejdovskyi peduncle 

 half the length of outer i-amus, inner ramus flattened, rudi- 

 mentary, shorter than peduncle ; in Crangonyx and Paracran- 



