Plate XV. 



Staitrocaïyptfis (jJaher It. P, 207. 



Fig. 1. A large specimen attached to a dead Periphragella elisœ (Sei. Coll. 

 Mus. No. 244). 1 nat. size. 



Fig. 2. Another attaclied to a specimen of a tnfaceous bottom (Soi. Coll. 

 Mus. No. 398). A nat. size. 



Fig. .3. Two young specimens attached to a dead Chonelasma calyx. 

 Nat. size. 



Figs. 4-6. Dermalia in different views. 300 x . 



Fig. 7. Gîistralia. Below, the free proximal ray. 300 x . 



Fig. 8. Microdiscohexaster. 300 x . 



Fig. 9. Discoctaster. 300 x . 



Fig. 10. Oxyhexaster. 300 x. 



Fig. 11. Portion of a longitudinal section throngh the wall of a yonng 

 specimen. Above, the oscular edge. 30 x . 



Fig. 12. Small portion of the basidictyonal plate. 100 x . 



Fig, 13. One of the small basidictyonal masses, fonnd in abundance in 

 the parenchyma of Sei. Coll. Mus. No. 361, — j-rubably basidicty- 

 onalia belonging to a yonng brood which had fixed themselves, 

 temporarily or otherwise, to the parenchymalia of the mother- 

 sponge. 50 X . 



