Vol. IX, No. 1.] Sponges of the Lake of Tiberias. 81 
[NV .S.] 
one species (P. chartaria) the amphioxous macroscleres are 
species of Corvospongilla. 
T'ype-species.—Potamolepis leubnitziw, Marshall. 
Distribution.—Tropical Africa. 
The species that certainly belong to Potamolepis are P. 
chartaria, Marshall, P. leubnitziw, Marshall, and P. pechueli, 
Marshall. P. weltneri, Moore,! is a doubtful species, possibly 
composite and possibly in part at least to be assigned to 
spongil e only specimen in the Indian Museum appears to 
represent P. pechueli.* 
Genus PACHYDICTYUM, Weltner. 
(Plate iv, fig. 3.) 
Wiegm. Arch. f. Naturgesch., Ixvii (1), p. 188, pl. vi, figs. 1-4 
and 6-26 (1901). 
! Moore, *‘ The Tanganyika Problem,’’ p. 323 (1903). : 
? It is from the Upper Luarula River, the Anarene being Isan- 
gila, a place on the Congo about 150 miles up stream from the sea. 
