Vol. IX, No. 1.] Sponges of the Lake of Tiberias. 85 
[N.8.] 
ach of the species of Nudospongilla that occurs in the 
lake exhibits very marked structural peculiarities probably of 
an adaptive nature, but the genus itself is distinguished from 
the Spongillinae, more especially from Stratospongilla (a sub- 
genus of the type genus Spongilla) by negative rather than 
positive characters. 
i the sponges of the Lake of Tiberias are in a state 
strong vegetative and reproductive vigour in October (i.e., 
wards the end of the hot dry season), unless they are actually 
undergoing desioation at the margin of the lake. 
ars to be possible to separate the sponge-fauna 
of the lake ato two localized groups, one ie which (consisting 
of Soran fluviatilis syriaca, Nudospongilia mappa 
the lake. 
BIBLIOGRAPHY. 
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(i 
yi a Freshwater Sponges, where = and 
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(1911). 
» “The Freshwater Sponges of the 
Malabar Zone,’’ Rec. Ind. Mus., vii, 
pp. 382-87 (1912). 
>» ‘* Notes on some Sponges from Lake 
Baikal in the collection of the - 
Petersburg,’’ Ann. Mus. Zool. Ac. Sci 
St. Pétersbourg, 1913 (ined.). 
Carter, H. J. .. ‘* History and coca otis 2 of the 
known Oiaeine pongilla,’’? Ann. 
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; (188 
Dybowski, W. .. “Studien uber die gprs gona des Russi- 
schen  Reiches besonderer 
Berucksichtigung "dee Spongien- 
Fauna des Bai ees,” Mem 
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