64 Journal of the Asiatic Society of Bengal. {January, 1913. 
a 
No gemmules were found. 
Type.—Z.E.V. No. 2° Ind. Mus. 
Habitat.—Lake of Tiberias, Palestine. The unique speci- 
men was taken (15-x-1912) close to the edge in less than one 
metre of water and within a few hundred yards of the exit of the 
Jordan on the east side, but not in the actual channel of the 
river. It grew on the lower surface of a stone, projecting out 
under another stone, and including a small twig in its substance. 
The free portion was about 5 mm. thick and some 30 mm. long 
and broad, but the shape was irregular. 
e most remarkable feature of N. reversa is the manner 
run sideways into a deep groove. The great breadth of these 
channels and their regular horizontal course are also character- 
istic. The spicules are intermediate in form between those of 
Cortispongilla barroisi and those of Nudospongilla aster. They 
are considerably stouter than those of N. mappa, specimens of 
which were taken together with the type. 
Nudospongilla mappa, sp. nov. 
(Plate ii, fig. 4; plate iii, figs. 3, 3a; plate v, figs. 2, 2a, 2b.) 
Sponge hard, forming thin films on the lower surface of 
stones, bright green in sunlight. white or yellowish in the dark. 
€ upper Surface is very minutely hispid; the lower surface 
‘bears a delicate chitinous membrane. On the upper surface 
sponge. The pores are larger than is usually the case in the 
Spongillidae, measuring about 0-052 mm. in diameter. They 
are grouped together immediately over the mouths of the main 
efferent channels, which run vertically downwards into the 
.—Except near the surface of the sponge, the 
pe ese reticulation is not well defined, but slender vertical 
res 
-such well-defined spines as in N. reversa. On the surface there 
is @ very distinct transverse reticulation, which, viewed from 
