80 Journal of the Asiatic Society of Bengal. (January, 1913. 
Type-species.—Spongilla corallioides, Bowerbank. 
Distribution.—Tropical and subtropical South America on 
the Atlantic side of the Andes. 
ollowing, species belong to the genus :—Uruguaya 
corallioides (Bowerbank), U. repens, Hinde, U. macandrewi, 
Hinde, U. pygmaea, Hinde, and U. amazonica, Weltner. U. 
amazonica is represented in the collection of the Indian Museum 
In describing the genus Potamolepis Marshall confessed 
that the only consideration which prevented him from uniting it 
with Uruguaya was a geographical one, and, so far as the origi- 
nal descriptions of the two genera go, there is no reason for 
considering them to be distinct, except that one group is found 
in Africa, the other in South America. This reason, as all 
students of the Spongillidae would probably now agree, is a 
very poor one. 
inde, however, since Carter and Marshall published their 
appearance is concerned, in his figures. I refer to the thickened, 
race (reticulata) of Spongilla lacustris and in S. crassissima ; 
S. moorei; but I know of no freshwater sponge except the 
species of Uruguaya in which it has the minutely and apparently 
granular (really pneumatic) structure characteristic of that 
genus. 
Subfam. POTAMOLEPIDINAE. 
Genus POTAMOLEPIS, Marshall. 
(Plate iv, fig. 2.) 
! Quart. Journ. Mier. Sei., xli (new series), p. 476 (i899). 
