176 



Prof. Ehrcnberg on Microscopic Life 



9. Gallionella Sol. 



10. ■ — Ti/mpanum. 



11. Grammatophora parallela. 



12. Hemiaulus antarciicus. 



13. Rhaphone'is fascial at a. 



14. Zyyocerosl australis. 



B. SILICEOUS PHYTOLITHARIA. 

 15. Spongolithis acicularis. 16. SponcjolWds Fastis. 



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 diver gens. 



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

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



Off Cockburn's Island (Cockbm-n^s Head) Dr. Hooker saw an 

 Alga, as the lowest and fui'thest step of vegetation, with forms of 

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

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

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

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

 and made up of Siliceous Polygastrica. An apparently unorganic 



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