90 



C. CHILTON. 



Fig, 11. Grammar us barring tonensis, 

 third uropod. 



Fi£. 12. Gammarus 



barring tonensi s , telson. 



Colour (in spirit) nearly white. 



Length of largest specimen. 11 mm. 



Locality, Barrington Tops, 4,000 ft., N.S.W. (C. Hedley). 



Remarks. — On some of the segments of the peraeon there 

 are finger-like appendages which appear to be of the same 

 nature as the "simple accessory branchiae" described in 

 Hyalella jelskli Wrzesn, and H. dijhoivskii Wrzesn. These 

 are present on the last three segments of the peraeon and 

 possibly also on the two segments anterior to these and 

 appear to arise from the sternum of the segment internal 

 to the branchia, but I cannot determine their exact occur- 

 rence and attachment without sacrificing too many of the 

 few somewhat imperfect specimens at my disposal. They 

 (fig. 8) are cylindrical, curved, tapering towards the sub- 

 acute apex and have the interior closely filled with round 

 refractive bodies looking like oil globules. I doubt if they 

 are branchial in function, but, whatever their nature, it is 

 interesting to note that they are found in species of two 

 different genera in localities high above the sea-level, viz. 

 Gammarus in Australia at a height of 4,600 feet, and 

 Hyalella on the Cordilleras in America, at a height of about 

 7,000 feet. Appendages, apparently similar, are found in 

 Waldeckia zschauii Pfeffer and other Antarctic Amphi- 

 poda. 1 



The fresh water Gammarids of Australia and Tasmania 

 described by Thomson, Sayce and G. W. Smith are already 



1 Chilton, Amphipoda of " Scotia" Expedition, Trans. Roy. Soc, Edin- 

 burgh, vol. 48. p. 472. 



