EXPLANATION OF PLATE VIIJ. 

 Semperella cvcumis, F. E. Sch. 



Fig. 1. Large specimen. One-half nat. size. After a photograph taken 

 by Dr. von Miihrenthal. 



Fig. 2. Part of the external surface in the vicinity of the lower end. 

 Nat. size. After a photograph taken by Dr. von Miihrenthal. 



Fig. 3. Arrangement of the spicules in a section of a part of the skin 

 and the septal wall, vertical to the surface, x 50. 



Fig. 4. Dermal macramphidisc. x 300. 



Figs. 5 and 6. Micramphidiscs. x 300. 



Fig. 7. Central part of an uncinate. >c 300. 



Fig. 8. Part of a micro-oxypentactine lying in the canal- wall, x 300. 



Fig. 9. Lower end of an anchor-spicule of the root-tuft. x 300. 



Fig. 10. Marginal spicule. > 300. 



Fig. IL Subdermal pentactine. x 50. 



Figs. 12 and 13. Dermal pinules. x 300. 



