450 Journ. of the Asiat. Soc. of Bengal. [Nov. & Dec., 1915, 
The Amphipoda and Isopoda of the Tiberias basin may, 
therefore, be said to be essentially Palaearctic (in one case 
Holartic) species ; several forms have become sufficiently differ- 
entiated in Syria or Palestine to be accepted as endemic. 
The Decapoda, which have been discussed by Barrois' and 
by Mr. Kemp and myself,? are represented in the Tiberias 
basin by three species, Atyaéphyra desmarestii (Millet), T'yphlo- 
caris galilea, Calman, and Potamon potamios (Olivier). 
occurs in the Palaearctic Region. It is found in all the coun- 
tries that surround the Mediterranean except in Egypt, where 
it is replaced by an extremely vigorous intrusive species, 
Caridina nilotica (Roux). This species is probably of Ethio- 
pian origin. The Syrian race of the Atyaéphyra is said to be 
distinct in certain particulars from that found both in southern 
Africa 
onotypic genus Typhlocaris is remarkably isolated 
em : 
both structurally and geographically, possessing certain anatom!- 
cal features that justify its acceptance as the type and sole 
ments that have ejected it and shut it off from its former home. 
Potamon 
] pan biol. Nord France V, p. 125 (1892). 
* Journ. As. Soc. Bengal (n.s.) IX, p. 241 (1913). P 
8 See Ekendranath hosh, Journ, Mik Soc. Bengal (n.s.) IX, Pp. sche 
pl. xvi, figs. 16, 17 (1913). 
