176 



Prof. Ehrenberg on Microscopic Life 



9. 

 10. 

 11. 



15. 



Gallionella Sol. 



— Tympanum. 

 Grammatophora parallela. 



12. Hemiaulus antarcticus. 



13. Rhaphone'is fasciolata. 



14. Zygocerosl australis. 



B. SILICEOUS PHYTOLITHARIA. 



Spongolithis acicularis. 16. Spongolithis Fustis. 



8. Sea-bottom drawn up by the lead from 270 fathom, in 

 63° 40' S. lat., 55° W. long. 



A. SILICEOUS POLYGASTRICA. 



C. CALCAREOUS POLYTHALAMIA. 

 53. Grammostomum divergens. 



9. Samples from Cockburn's Island, the furthest limit of vege- 

 tation at the South Pole, 64° 12' S. lat., 57° W. long. 



Off Cockbunr's Island (Cockburn's Head) Dr. Hooker saw an 

 Alga, as the lowest and furthest step of vegetation, with forms of 

 Protococcus. The Alga is one of the Tetraspora allied to Viva, 

 which Dr. Hooker has reserved in order to describe more accu- 

 rately : I have not recognised the Protococcus in its dried con- 

 dition. This mass, however, is chiefly and equally peopled with 

 and made up of Siliceous Polygastrica. An apparently unorganic 



