86 



C. CHILTON. 



but may be distinguished by the points given by Caiman. 

 In it the outer lobe of the maxilliped is broadly rounded. 



Caiman 1 has pointed out that there is some discrepancy 

 in the published accounts of the pleopoda of T. sylvaticus. 

 G. M. Thomson and Sayce state that they are unable to 

 find the third pair, while Chevreux, who examined speci- 

 mens from Mount Kosciusko sent to him by myself, states 

 that it resembles the first two pairs in being biramous, 

 although of smaller size, and this is confirmed by Caiman 

 by the examination of two specimens received from the 

 Australian Museum. I have not been able to examine the 

 pleopoda in the single specimen from Barrington Tops. It 

 would not be surprising if there are considerable individual 

 differences in the development of these pleopoda, since they 

 are to be looked upon as functionless vestigial organs in a 

 species that is characteristically terrestrial. 



Gammarus barringtonensis, sp. nov. (figs. 4 to 12). 

 In the collection were a few specimens of varying sizes 

 of a Gammarid which it is not easy to identify with any of 

 the somewhat numerous species of this group already 

 described from Australia. In general appearance, in the 

 structure of the antennae, gnatliopods, peraeopods and 

 telson, it presents very considerable resemblances to 

 Gammarus australis Sayce, a found in different localities in 

 Victoria, though the long setae on the appendages appear 

 to be much less numerous. It is, however, clearly marked 

 off from this species and from the allied species, Gammarus 

 haasei Sayce, 3 also found in Victoria, by the structure of 

 the third uropod which has the inner ramus quite small 

 and vestigial, as in the genera Niphargus and Neoniphargus. 

 In this character and also in the gnathopods, antennae, etc., 



1 Caiman, loc. cit., p. 135. 



■ Sayce, Proc. Roy. Soc. Victoria, vol. 13, (new series) p. 233. 



3 Sayce, loc. cit., vol. 15, p. 53. 



