EXPLANATION OF PLATE VII. 

 Hyalonema affine reticuJatumi. F. E. Sch. 



Fig. 1. A specimen. Nat. size. After a photograph taken by Dr. von 

 Mahrenthal. • 



Fig. la. The root-tuft belonging to this sponge, which had been broken 

 off, Nat. size. 



Fig. 2. Parenchymal micro-oxyhexactine. x 300. 



Fig. 3. Parenchymal micro-oxyhexactine. x 300. 



Figs. 4 and .5. Dermal pinnies, x 300. 



Fig. 6. Dermal macramphidisc. x 30i). 



Fig. 7. Small specimen in lateral view. Nat. size. 



Fig. 7a. The same specimen seen from above. Nat. size. 



Figs. 8, 9 and 10. Three different specimens. Nat. size. 



Fig. 11. A larger specimen in lateral view. Nat. size. 



Fig. llci. The same specimen seen from above. Nat. size. 



Fig. 116. Micro-oxyhexactine. x 300. 



Fig. lie. Dermal pinule. x 300. 



Fig. 11(7. Dermal macramphidisc. x 30i). 



