PLATE IL 



Spirastrella purpurea (Lmk.) Rdl. 

 (Photo's after the original specimens). 



Fig. i. S. E. 305 c. Side view. Natural size. 



Fig. 2. B. M. 11. Suberites inconstans var. digitata Dy. Probably one of the co-types. Seen from above, 



after a dry specimen. Natural size. 

 Fig. 3. S. E. 1341a. Side view. Natural size. 

 Fig. 4. S. E. 1211. Side view. Natural size. 



Fig. 5. B. M. 29. Hymeniacidon angidata Bwk. Seen from above, after a dry specimen. Natural size. 

 Fig. 6. S. E. 1447. Side view. [Compare fig. 4 on PI. IV]. Natural size. 



