Plate XI. 



Page 



Fig. I. Renzera urceolus Rathke et Vahl. Oxea, x 255 35 



— 2. Reniera parenchyma n. sp. Oxea, x 255 37 



— 3. Reniera parenchyma 11. sp. Section through the middle of the skeleton of the 



sponge, parallel to the siirface, showing oscular canals and polyspicular longi- 

 tudinal fibres, x ca. 20 — 



— 4. Reniera parenchyma n. sp. Section of the skeleton vertical on the surface, 



X ca. 20 — 



— 5. Reniera folium n. sp. Oxea, x 255 39 



— 6. Reniera ventilabrum Frstdt. Oxea, x 255 40 



— 7. Reniera ventilabrum Frstdt. Skeleton seen from the surface, showing an oscu- 



lum and the spicules projecting from the edge of it, x ca. 54 — 



— 8. Reniera hyalina n. sp. Oxea, x 255 42 



— 9. Reniera clavata Levins.? Oxea, x 255 43 



— 10. Reniera cinerea Grant. Oxea, x 255 43 



— II. Reniera tttbiilosa Frstdt. Oxea, a fully developed of different sizes, b develop- 



mental forms, X 255 44 



— lie. Reniera tiibulosa Frstdt. The ends of different oxea. x 485 — 



— 12. Reniera tubulosa Frstdt. Section of the skeleton vertical on the surface, x ca. 60 — 



— 13. Reniera laxa n. sp. Oxea, x 255 46 



— 14. Reniera heterofibrosa n. sp. Oxea, x 255 47 



— 15. Reniera calamus n. sp. Oxea, a of the large ones, b of the small ones, x 255.. 48 



— 16. Reniera calamus n. sp. Radial longitudinal section of the skeleton, x ca. 60 . . . — 



— 17. Reniera sp. a. Oxeum, x 255 49 



