PLATE LI 



Fig. I. Haliclona variabilis (Thiele). Slightly less than natural size. 



Fig. 2. Haliclona variabilis (Thiele). Natural size. 



Fig. 3. Haliclonissa verrucosa, sp.n. Holotype. x f . 



Fig. 4. Isodictya antarctica (Kirkpatrick). x \. 



Fig. 5. Isodictya microchela (Topsent). x f . 



Fig. 6. Mycale macrochela, sp.n. Holotype. x f . 



