FRESHWATER ALG^ 267 



Cocconeis litigiosa V. Heurck. 



Lyngbya limnetica Lemm. 



L. murrayi sp. n. 



Phormidium fragile (Menegh.) Gomont. 



Oscillatoria deflexa sp. n. 



0. chlorina Kiitz. 



limosa Ag. 



Chroococcus cohcerens (Breb.) Nag. 



Chr. minutus (Kiitz.) Nag. 



Chr. minor (Kiitz.) Nag. forma minima West. 



Microcystis chroococcoidea sp. n. 



Asterocystis antarctica sp. n. 



4 Penguin Rookery, Cape Royds 



February 3, 1909. On the sloping ground below the rookery, largely permeated 

 by the drainage from this nesting- place, were masses of the Hormidium- stage of 

 Prasiola crispa. Amongst the filaments were vast numbers of Navicula muticopsis. 



A small pond in the rookery, which was never observed with water in it, contained 

 quantities of Prasiola crispa forma aspera. 



5 Small, almost dried-up lake, Cape Royds 



Not far from the Penguin Rookery. [No further data.] Material consisted of a 

 great quantity of Ulothrix cequalis, amongst which were Phormidium retzii and large 

 numbers of Navicula muticopsis, 



6 Moraines near camp, Cape Royds 



March 12, 1908 ; coll. J. Murray. Material collected in underground pockets, 

 believed to have formed part of an old lake-bottom. No Algae of any kind were 

 observed in this collection. 



7 Recent geological deposit containing subfossil diatoms 



Coll. J. Murray. Material obtained from the summit of a small hill about 200 

 feet high, near Cape Royds. Believed by the geologists to be the bottom of an old 

 tarn. 



Contained four species of interesting diatoms, three of which were found in the 

 ponds and lakes, the remaining one being new. The species were: Navicula muti- 

 copsis V. Heurck, N. globiceps Greg., N. peraustralis sp. n., and Stauroneis anceps 

 Ehrenb. var. amphicephala Kiitz. 



8 Blue Lake, Cape Royds 



December 10, 1908 ; coll. J. Murray. This was the largest lake of the district, 

 situated half a mile east of the camp. It was never even partially melted. The 



