76 ME. GEOFFREY WATKIN SMITH ON THE 



Neoniphargtjs NIGER, sp. n. 



Head as long as two following segments. Eyes small, oval. 



First antennae very long ; the third segment of peduncle not so long as second ; 

 lmnches of slender setae ; secondary appendage with three short joints, the whole not as 

 long as first segment of flagellum (PI. 15. fig. 1). 



Pereiopods armed with slender numerous setae ; terminal joint not slender or 

 elongated. 



Uropod 3 extends a great way behind the other two pairs ; its outer ramus is long, 

 armed with long and rather slender setae, without a small terminal joint ; the inner ramus 

 is minute and normal (PI. 15. fig. 2). 



The telson is acutely cleft for about three-fourths to the base ; the lobes carry three 

 stout spines apiece and several slender long setae (PI. 15. fig. 4). 



The segments of the metasome are furnished dorsally and dorso-ventrally with bunches 

 of exceedingly long and conspicuous setae. 



The gnathopods (PI. 15. fig. 3), of which the second pair is distinctly the larger, have 

 the two penultimate joints more elongated than is usual in this genus, and more heavily 

 armed with setae. They resemble rather more the gnathopods of Gammarus. 



Length 8 mm. 



Colour. Black. 



Occurrence. Under stones in Lake Perry, Harz Mountains. 



Neoniphargus montantjs, Thomson, Proc. Roy. Soc. Tasmania, 1892 (1893), p. 70. 



This species agrees very closely with N. yuli, but differs in the absence of a rudimentary 

 terminal joint to uropod 3, in the fewer setae on the lobes of the telson, and in the less 

 spinose pereiopods. 



I have been unable to examine this species closely, as the tube in which I had collected 

 some was broken. 



Prom pools on the top of Mt. Wellington. 



Neoniphargtjs spenceri. 



Unimelita spenceri, Sayce, Proc. Roy. Soc. Victoria, vol. xiii. (1900) p. 238. 



This species agrees most closely with N. tasmanicus from the Great Lake. It differs, 

 however, in a number of essential points — e. g., shape of telson, great length of 

 uropod 3, shortness of secondary appendage, &c. 



Prom Lake Petrarch. 



Genus Gammarus, Fabr. 



Remarks. — The genus Gammarus as restricted by Stebbing (Das Tierreich, Crustacea, 



Amphipoda Gammaridea, 1906) is confined chiefly to the freshwaters of the Northern 



Hemisphere. It is absent from the tropics and the Southern Hemisphere. Sayce 



has, however, described two species, G. australis and G. haasei, from Victoria, 



