Contributions to the Crustacean Fauna of South Africa. 231 



2. DESCRIPTION OP A NEW SPECIES OF PHREATOICUS (!SOPODA) 



FROM SOUTH AFRICA. 



(Plates XXIII. and XXIV.) 



The tribe Phreatoicidea, Stebbing, was instituted to receive some 

 peculiar Isopods resembling most nearly the Asellota, but differing 

 from them in certain respects and possessing also an external 

 likeness to the Amphipoda. It contains a single family, comprising, 

 besides the typical genus with eight species, three other genera 

 each with only one species. 



The following is a list of all the hitherto known species. 



TRIBE PHREATOICIDEA, Stebbing, 1893. 



FAMILY PHBEATOICIDAE, Chilton, 1891. 



1. GEN. PHREATOICUS, Chilton, 1882. 



1. P. typicus, Chilton, 1882. A blind species, from wells near 



Canterbury, New Zealand. 



2. P. aus trails, Chilton, 1891. With eyes, from Mt. Kosciusko, 



5,700 ft., Victoria, Australia. 



Thompson, 1892, reported this species from Mt. Wellington, 

 Tasmania, but subsequently (1894) referred his original specimen 

 to the young of his species P. tasmaniae. Since then Smith, 1909, 

 has recorded P. australis from several localities in Tasmania, from 

 sea-level to the top of Mt. Wellington, 4,000 ft. According to the 

 arrangement of spines on the uropods he distinguishes three varieties, 

 to which, however, he does not give separate names. 



3. P. asswulis, Chilton, 1894. Blind, from wells near Canterbury, 



New Zealand. 



4. P. tasmaniae, Thomson, 1894. With eyes, from the Great Lake, 



3,000 ft., Tasmania. 



