82 Journal of the Asiatic Society of Bengal. [January, 1913. 
The foregoing discussion of the genera other than Corti- 
spongilla and Nudospongilla that belong to the new subfamily 
Potamolepidinae, and of the Spongilline genera liable to be con- 
fused therewith, has cleared the way for a consideration of the 
precise taxonomic position of the sponges of the Lake of Tiberias. 
‘he new genus (Nudospongilla) is proposed, and placed in 
the Potamolepidinae largely as a matter of convenience, in 
order to facilitate the classification of those freshwater sponges 
in which there is some evidence either that gemmules are never 
produced or, being produced, are devoid of microscleres and 
other characteristic features. In other words, there is evi- 
absolutely free of microscleres and could only be assigned to 
it because their skeletal structure was identical with that of 
stand the test of research and criticism, I think its recogni- 
tion convenient as an aid to future investigations. Even i 
Spongilla lacustris or any other typical species of any recog- 
nized gemmule-bearing genus could be proved by actual 
