PLATE I. 



Fig. 1. Dexiobranchsea ciliata, Gegenbaur. Ventral aspect ; magnified ten diameters. 

 Fig. 2. Dexiobranchsea minuta, n. sp. Ventral aspect ; magnified twenty diameters. 

 Fig. 3. Dexiobranchiea simplex, Boas. Ventral aspect ; magnified fifteen diameters. 

 Figs. 4, 5. Dexiobranchwa polycotyla, Boas. 



Fig. 4. Adult, ventral aspect; magnified twelve diameters. 

 Fig. 5. Larva, ventral aspect; magnified forty diameters. 



Figs. 6, 7. Spongiobranchasa australis, d'Orb. 



Fig. 6. Ventral aspect ; magnified eight diameters. 

 Fig. 7. Dorsal aspect; magnified eight diameters. 



Fig. 8. Pneumonoderma mediterraneum, van Ben. Ventral aspect; magnified four 

 diameters. 



Fig. 9. Pneumonoderma violaceum, d'Orb. Lateral (right) view ; magnified five 

 diameters. 



