Vol. 1X, No. 1.] Sponges of the Lake of Tibervas. 87 
[N.S.] 
auct.) du Lac de aaron eters 
ord de 
Rev. biol. du ance, V, 
No. 8, p. 1 (18 
Topsent, E, ts “ Description Hie variete nouvelle 
d’Eponge d’eau douce (Ephydatia 
fluviatilis, auct., var. syriaca, Top- 
sent),’’ Bull. Soc. eae des Sciences 
de Rouen, 1909, p. 
Weltner, W. iy ed Spongillidenstudien, “OT. Katalog 
und Verbreitung der bekannten Suss- 
wassersoh War me,’ iegm. Arch. 
f. Naturgesch., 1xi (1), pp. 114-144 
1895 
~ a ‘« Susswasserspo ongien von Celebes 
(Spongillidenstudien, IV),’’ Wiegm. 
Arc f. Naturgesch, Ixvii (1), 
pp. 185-294 (1901). 
EXPLANATION OF PLATES. 
Puate II. 
Photographs of Sponges from the Lake of Tiberias. 
(nat. size.) 
Fig. 1.—Large specimen of Cortispongilla barroiss (Topsent) 
attached to a small stone. The dark depressed mark close 
to the single large osculum shown in the photograph prob- 
ably represents a young sponge of Nudospongilla aster. 
Fig. la.—Vertical section through the osculum of a rather 
smaller sponge possessing one one oscular system: to 
show the branched central cavity. 
Fig. 2.—Part of the type-specimen of Nudospongilla reversa, 
showing the deep oscular grooves. 
Fig. 3.—Type-specimen of Nudospongilla aster (on a flint 
nodule). 
Fig. 4.—Type-specimen of Nudospongilla mappa. 
Puate IIT. 
Skeletons and pisces of Sponges from the Lake 
Tiberias. 
Fig. 1. ee a fava syriaca, Topsent. A. Skeleton- 
spicules, x Gemmule-spicules, x 1 
Fig. 2. Skeltonapicules of Nudospongilla reversa (A. 20: 
B. Fig. 2a.—Vertical section of part of pe i 
feat oF ‘skeleton, x 20. 
