268 W. AND G. S. WEST 



material was obtained from under fifteen feet of ice in one place and from one to 

 three feet in another. The ice of this lake yielded water of such purity that it 

 could be used in place of distilled water in chemical experiments. 



The material consisted of thin, tough sheets of Myxophycese, of a deep blue-green 

 colour and 0.5-1 mm. in thickness. The greater part of the material consisted of 

 Phormidium glaciale, with smaller quantities of Phormidium inundatum and Lyngbya 

 martensiana. A species of Calothrix was also present in small quantity. Among the 

 blue- green sheets were Pleurococcus antarcticus forma robusta and Chlamydomonas 

 nivalis (in the resting state). 



No diatoms were observed in the lake. 



On the ground not far away from the margins of the lake was an abundance of 

 Prasiola crispa in the Schizogonium-stage and with quantities of the earlier Pleuro- 

 coccws-like stages. Amongst it were large numbers of Navicula muticopsis. 



9 Coast Lake, Cape Royds 



One mile from the camp. Some open water on November 28, 1908, and all 

 clear of ice early in January 1909 ; completely frozen over again early in February. 

 Temperature of water at the edge of lake : December 4, 1908, 47 F. ; January 2, 1909, 

 40 F. ; January 18, 1909, 45 F. This was the best lake for animal life. 



(a) September2, 1908. Expanded sheets of a deep blue-green colour, often bleached 

 and about 1 mm. in thickness, consisting of two species of Phormidium, more especially 

 Ph. glaciale. 



(b) January 1909; coll. J. Murray. Algae were all Myxophyceae, but all free- 

 floating. No sheet-like expansions observed. No diatoms. Mostly species of Oscil- 

 latoria, such as 0. deflexa, 0. cortiana, 0. formosa, 0. tennis, 0. subproboscidea, and 

 0. limosa, with small quantities of Lyngbya kutzingii, Microcystis stagnalis, and 

 Chroococcus minutus var. obliteratus. 



10 Clear Lake, Cape Royds 



April 1908 ; coll. J. Murray. This lake was one mile north of the camp, and 

 was never seen clear of ice. The temperature of the water was just above freezing- 

 point, the highest reading being 35 F. under nine feet of ice. 



(a) Material obtained from the bottom of the lake at a depth of 17 feet. It was 

 black and smelt offensively, but contained many species of ciatoms. Also small 

 quantities of Pleurococcus antarcticus, the cells of which contained one or two small 

 globules of a fatty oil. 



(b) Material melted from the ice and consisting of layers of Algae. Some were 

 sheets of Phormidium glaciale with a slight admixture of Oscillatoria cortiana ; others 

 were compactly interwoven layers of Ulothrix cequalis. 



11 Deep Lake, Cape Royds 



October 1908 ; coll. J. Murray. Two miles south of camp, lying in a deep 



