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HYALONEMA (THALLONEMA) GEMINATUM. 
anchor lies on the same side of the shaft as the shortest side of the other. The 
dimensions of a typical amphidisc of this kind are: — total length 22 /*; thick- 
ness of shaft 1.5 m! length of the longest and shortest parts (sides) of the anchors 
respectively 7.5 m and 4 breadth of anchors 9 n. 
The nearest allies of the above sponge are Hyalonema ( Skianema ) aequa- 
toriale and H. ( S .) umbraculum described in this Report. From both it is 
distinguished by the possession of large geminate macramphidiscs and small, 
long-spined canalar pinules, and by other differences in the spiculation. 
