vii FRESH-WATER MALACOSTRACA 2 I I 



111 the Southern Hemisphere we have a species of Anai<j<i<I<'x, 

 A. ftisimniiae, occurring in mountain streams and tarns in 

 Tasmania,, a related form which haunts the littoral zone of the 

 Great Lake in Tasmania, and a small species, Kmi/iu IKJH cursor, 

 occurs in a little stream near Melbourne. 



Of the Isopoda certain genera, viz. Asdlv.s and Monolis/rit, 

 are confined to fresh water, others, such as ^/Jiitrroma, Idot/i>', 

 Alitropns, and Cymothoa, have occasional fresh - water repre- 

 sentatives. Packard r describes a remarkable blind Isopod, 

 Caccidotea, from the Mammoth Cave of Kentucky, which occupies 

 a very isolated position, and in the same work gives a very 

 complete exposition of the cave-fauna of North America and 

 Europe. 



The Phreatoicidae are a curious family of Isopods confined to 

 the fresh waters of Australia and New Zealand, which bear a 

 remarkable resemblance to Amphipods, being laterally c< im- 

 pressed and possessing a subchelate hand on the anterior thoracic- 

 leg. These Isopods are exceedingly common in small mountain 

 pools and in streams in Tasmania, and in the Great Lake in 

 that country I have recently found a number of species which, 

 together with some species of Amphipods, make up the dominant 

 feature in the Crustacean fauna. One of these species may grow 

 to fully an inch in length. The family is confined to 1 1n- 

 temperate regions, and is usually found on mountains. A 

 number of species are known from the mainland of Australia, 

 HIM- coming from a high elevation on Mount Kosciusko, and 

 another (Phreatoicopsis) from the forests of Gippsland attaining 

 a groat si/e, and living among damp leaves, etc. 



The fresh-water Amphipoda all belong to the families 

 Talitridae, ( Jammaridae, and Haustoriidae (sec p. 1.". 7). 



Among the Talitridae, or Sand-hoppers, Orchestia and T<ilitrnx 

 have marine as well as fresh-water and land ivpreseiitat i\es, \\ hile 

 the Anieriean Hyalella is entirely from fresh water, most of tin- 

 species beinu peculiar to Lake Titieae;i. Many of these animals 

 are partly emancipated from an aquatic life. Thus Orchestia 

 gammarelliix, which is common on the sea-shore of the Mediter- 

 ranean, frequently penetrates far inland, and was found in large 

 numbers by Kotsehy near a sprinv; -1(100 fed up on Mount 

 Olympus. 



ir<is/i<ii>//<ni, iii., IS-* 5 '!, )\ 1. 



