Tee ase 
Vol. IX, No. 1.] Sponges of the Lake of Tiberias. 59 
[N.S.] 
A. Sponge massive, with deep - 
round oscula i na al adie beee bar- 
st (p. 67). 
B. Sponge encrusting the lower 
surface of stones; oscula never 
consisting of large rounded 
apertures. 
a. Oscula consisting of deep 
open eet es of a simple 
chara < .. Nudospongilla rever- 
sa (p. 63) 
6. Oscula approached by deep 
by the dermal membrane... N. mappa (p. 64). 
ule 
groups on Mer surface with- 
out a ite osculum; 
BC Oras oak more mas- — 
sive, less regular and more 
friable than in other indi- 
genous species. . .. NV. aster (p. 65). 
Fam. SPONGILLIDAE. 
Subfamily SPONGILLINAE. 
To this subfamily I assign all the freshwater sponges in 
which true microscleres are foun 
Ephydatia fluviatilis syriaca, Topsent. 
(Plate iii, fig. 1.) 
Ephydatia fluviatilis, Topsent, Rev. biol. Nord France, 1893, 
i eee 
H. fluviatilis var. syriaca, id., Bull. Soc. Amis Sci. Nat., Rouen, 
909, p. 1. 
Specimens 2 Ephydatia pet oor were not uncommon in 
October 1912, on the lower surface of stones standing in the 
water at the Bae of the lake near "Tiberias, “Mejdal and Tab- 
ghah. They formed small crusts not more than two or three 
millimetres thick and three or four centimetres in diameter. 
In places were sunlight penetrated under the stones they had 
green corpuscles in their parenchyma-cells, and were as a rule of 
a bright leaf-green colour. In some places, however, notably 
in the neighbourhood of Mejdal, the green was ma yore but not 
altogether obscured, by a blackish tinge due to minute dark 
particles, apparently inorganic, in the smbenkeynnaceli In 
