PLATE VI. 



Fig. 1. Portion of the skeleton oi Etispongia officinalis, var. lohosa, no v.; natural size. 



Fig. 2. The same oi Hippospongia anomala, n. sp.; natural size. 



Fig. 3. The same of Hippospongia mauritiana, Hyatt (a, from above ; b, from the 

 plane of section) ; natural size. 



Fig. 4. The same of Cosciiioderma denticidatum, n. sp.; x 5. 



Fig. 5. The same of Cacospongia amorpha, n. sp.; natural size. 



Fig. 6. The same of Cacospongia procumbens, n. sp.; x 2. 



Fig. 7. The same of Cacospongia intermedia, u. sp.; natural size. 



Fig. 8. The same of Cacospongia nwrraiji, n. sp.; natural size. 



Fig. 9. The same of Cacospongia vesiculi/era, n. sp.; natural size. 



Fig. 10. The same of Cacospongia irregidaris, n. sp.; natural size. 



Fig. 11. The same of Cacospongia compacta, n. sp.; natural size. 



Fig. 12. The same of Cacospongia spinifera, n. sp.; natural size. 



Fig. 13. The same of Cacospongia oligoceras, n. sp. ; x 2. 



Fig. 14. The same of Cacospongia dendroides, n. s]").; natural size. 



Fig. 15. T\iQ &&va.Q oi Stelospongoslongispinus,T)\\(:h..&n({Mich..-, natural size. 



