FEESHWATER CRUSTACEA OF TASMANIA. 



79 



Occurrence. In a small stream near the Magnet Mine on the west coast of Tasmania. 

 Also in Victoria, Dandenong Creek ; and a blind species, G. haasei (Sayce), also from 

 Victoria. 



Genus Chiltonia. 



Stebbing, Trans. Linn. Soc. Lond. ser. 2, Zool. vol. vii. (1899) p. 408. 

 The type species of this genus was described as Hyalella mihiwaka by Dr. Chilton 

 from New Zealand. Subsequently Sayce described H. australis from numerous locabties 

 in Victoria and from Lake Petrarch in Tasmania. The genus Hyalella is otherwise 

 confined to S. America. Stebbing pointed out some differences between the New Zealand 

 species and the S. American Hyalella and jiroposed a new genus Chiltonia. The chief 

 differences between Hyalella and Chiltonia are the presence in the former of a minute 

 rudimentary palp to the first maxilla?, and also the presence of a lobe on the wrist of the 

 second gnathopoda in the male. Evidently the two genera are closely allied, and can 

 hardly have been independently derived. 





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Chiltonia australis (Sayce). 



This species can be at once distinguished from the other freshwater Gammarids in 

 Tasmania by the short first antennae and the entire absence of a secondary appendage, by 

 the pronounced sexual difference in the gnathopods (the second pair in the male being 

 greatly enlarged), by the absence of a palp on the first maxilla?, and by the undivided 

 telson. The colour is pale green and the length about 8 mm. 



Occurrence. Southern Victoria (Sayce) ; in Tasmania the localities are Lake St. Clair, 

 the Great Lake, Lagoons on Bruni Island, Clyde River near Bothwell ; in fact, it is the 

 most widely distributed species in Tasmania. 



Genus Talitrtjs, Latr. 



Talitrtjs stlvatictjs, Haswell, Proc. Linn. Soc. N.S.W. vol. iv. (1880) p. 246 ; also see 

 Thomson, Proc. Roy. Soc. Tasmania, 1892 (1893), p. 15. 



This species of land-hopper is widely distributed in the highlands of Tasmania, being 

 found under logs and leaves in the forests on Mt. Wellington and in very great abundance 

 in the beech-forests on the mountains of the West Coast. It also occurs in Victoria 

 (Mt. Kosciusko). 



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