Plate IV. 



Page 



Fig. I. Eiiinastia siticns O. S. A pore papilla. A little more than - 'i 31 



— 2. Eiiinastia siiieiis O. S. An oscular papilla. A little more than ^/i — 



— 3. Eiimastia sitieiis O. S. A pore- and oscular papilla. A little more than ^/i . . . . — 



— 4. Euiiiastia si'iieiis O. S. A pore papilla cut through , showing the skeleton. A 



little more than '/i — 



— 5. Eiiinastia sitiens O. S. The end of an oscular papilla, ca. '^/j — 



— 6. Eiiinastia sitiens O. S., attached to a. Pecten islandictis\ in a couple of the papillae 



is seen Aristias tinnidus Kr. '/i — 



— 7. Pctrosia crassa Cart, attached to a little stone together with an Octactinia. 



At the lowermost part of the sponge the skin is partly wanting, '/i 54 



— 8. Petrosia crassa Cart. One of the most differentiated oscula. ^/i — 



— 9. Petrosia crassa Cart. Section of the sponge through an osculum, showing espe- 



cially the radiating canals, and partly those parallel to the surface, '/i — 



— 10. Desniacella Peac/iii Bow. A quite young individual on a fragment of a Sipho. 



— II. Desmacella Peachii Bow. A somewhat older individual on a fragment of a 



Sipho. iji — 



— 12. Desmacella Peachii Bow. 'i — 



— 13. Desmacella Peachii Bow. A calicular specimen, the skin is wanting, and the 



edge is damaged. 7i — 



— 14. Biemma annexa O. S. a the place of attachment, '/i ^5 



