EXPLANATION OF PLATE XL 



Fig. I. Large type Cocconeis ceticola, Nelson, from a Fin whale: x 200. 



Fig. 2. Cocconeis ceticola, Nelson. Girdle view, showing protoplasmic 

 processes: x 1000. 



Fig. 3. Cocconeis ceticola, Nelson. Spore formation and free micro- 

 spores: X 1000. 



Fig. 4. Penetration of the epidermis of a Blue whale by Cocconeis ceticola. 



Fig. 5. Cocconeis wheeleri, n.sp., from a Humpback whale: x 200. 



Fig. 6. Cocconeis wheeleri, n.SY). Lower valve: x 1000. 



Fig. 7. Cocconeis wheeleri, n.s^. Girdle view: x 1000. 



Fig. 8. Penetration of the epidermis of a Sperm whale by Navicula sp. 



Fig. 9. Small Navicula with Cocconeis ceticola, from a Fin whale : x 430. 



Fig. 10. Gyrosigtna arcticum with Cocconeis ceticola, from a Fin whale: 

 X 200. 



Figs I, 5 from photos by J. F. G, Wheeler: Figs. 9, 10 from photos 

 by A. Saunders. 



