Vol. XI, Nos. 10 & 11.] The Fauna of the Jordan System. 443 
[NV.S.] 
Erianotus lanosus, Duf.,'! and at least one species of Carabid 
beetle and one of Thysanura. The spider Oxyopes obtabilis, 
Cambr., was as common at the margin in October as Barrois 
(op. cit., p. 279) found it to be in May. 
Most of the molluscs of the lake live at depths of between 
2 and 20 metres and one (Pyrgula barroisi, Dautz.) has only 
been found, in a living condition, at still greaterdepths. Several 
species of ‘‘ Entomostraca’’ are also found as a rule only 
near the bottom in the deeper parts of the lake, notably 
Daphnia lumholizi, Sars, Hctinosoma barroisi, Rich. and Lao 
phonte mohammed, Blanch. and Rich. 
The fauna of the channel of the River Jordan as it passes 
through the lake apparently differs considerably from that of 
_ the main area, owing to the fact that the current is sufficiently 
strong to keep the bottom free of fine mud. The sponge 
covered anywhere else in this lake. Possibly the Gastropod | 
yrguia barroisi is also confined to it, but I found only dead 
shells in that part of the channel I was able to explore. 
Although some species are thus peculiar to or characteris- 
tic of certain areas, I do nct think that it is possible to distribute 
the fauna of the lake into definite bathymetric zones. The 
reason why many of the molluscs are scarce or absent at the 
extreme margin possibly lies in the fact that shells of all kinds 
are eagerly collected by the people of Tiberias for sale t 
tourists, who naturally prefer the larger and more conspicu- 
ous forms ; ‘‘dead’’ shells of Melania tuberculaia that have 
lost their epidermis and have become completely white are 
particular favourites. 
ocera, i 
fers mingled with comparatively large quantities of microscopic 
algae. The most abundant Entomostraca are Diaphanosoma 
1 Acanthia variabilis var. cohnectens, Horv., which inhabits the 
f the lake does not live under stones, but flies from stone to 
stone just as Leptopus assuanensis does at the edge of some Indian 
lakes. 
