31. Entomostraca from the Lake of Tiberias. 
By Ropert Gurney. 
Communicated by Dr. N. ANNANDALE. 
The collections of Entomostraca submitted to me by Dr. 
Annandale were chiefly plankton samples from Lake Tiberias 
itself, but included also three bottles containing specimens from 
small pools near the Lake. In addition to these collections I 
have had the opportunity of examining specimens hatched 
either in Calcutta or here in England from mud taken by Dr. 
Annandale from other similar pools. 
The plankton of Lake Tiberias seems to be very uniform 
and to consist of the following species :— 
CLADOCERA. 
Diaphanosoma brachyurum, Liévin, 
Ceriodaphnia reticulata, Jurine, 
:; rigaudi, Richard, 
Bosmina longirostris var. cornuta, Jurine. 
CopEPopDa. 
Cyclops leuckarti, Claus. 
All the collections, whether taken by night or by day, con- 
tained an abundance of Copepods, nearly all of them immature. 
The few mature specimens found were all of the one species, 
C. leuckarti. 
The Cladocera seem to show some diurnal migration, since 
they are far more numerous in the night collections than in 
those taken during the day. The latter consist almost entirely 
of immature Copepods. 
The plankton taken by Dr. Annandale in October scarcely 
differs from that described by Dr. Barrois, who visited the La e 
in May.!_ He found precisely the same species, with the addi- 
tion of Daphnia lumholtzi, which he notes is confined to the 
deeper waters and was only once found at the surface. He 
also found the majority of the Cyclops of the plankton to be 
immature. 
The other collections made by Dr. Annandale were as 
follows :— 
(1) Ain-et-Tineh. Townetting in a small pool full of 
Ranunculaceous water-weeds. 7-x-12. 
Cyclops serrulatus, Fischer. 
A few ostracod shells. _ 
Se 
1 Barrois, Rev. biol Nord France, VI, 1894, p. 284. 
