170 SAUNDERS [406] 



Cosmarium broomei Thwaltes. (Plate xliii, figs. 26, 35, 36.) 

 In freshwater, Popof Island. 

 Diameter 40 /x, length 40 /i. 



Cosmarium ornatum Ralf. (Plate xliii, fig. 3.) 



Very abundant in a freshwater pond, Kukak Bay ; Cook Inlet. 

 Diameter 32-45 /^, length 38-75 [i. 



Cosmarium sphalerostichum Nordst. (Plate xliv, fig. 6.) 

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 16 /x, length 16 11. 



Cosmarium pseudotaxichondrum Nordst. (Plate xliii, fig. 5.) 

 In freshwater ponds near Prince William Sound. 

 Diameter 33 /j, length 22 ix. 



Pleurotaeniopsis pseudoconnata (Nordst.) Lagerh. 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 27 //, length 38 /-x. The sinus is broad and very shallow 

 and the margins distinctly striate ; cytoderm finely punctate ; the end 

 view a perfect circle and the chlorophyll body divided into eight equal 

 arms. 



Pleurotaeniopsis debaryi (Archer) Lund. (Plate xliv, fig. 20.) 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 6^ 11^ length 100 //., isthmus 40 11 broad. Only one speci- 

 men was found and this agrees with Nordstedt's variety spitsbergensis. 



Pleurotaeniopsis ralfsii (Br^b.) Lund. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 54 jj.^ length 70 /x. 



Staurastrum dejectum Breb. (Plate xliv, fig. 5.) 

 J In a freshwater pond near Seldovia, Cook Inlet (422). 

 Diameter 21 /x, length 21 //.. 



Staurastrum dejectum mucronatum (Ralfs) Kirchn. 

 Occurs with the type. 

 Diameter 27 ^t, length 27 //. 



Staurastrum ravenelii Wood. (Plate xliv, fig. 29.). 

 In a freshwater pond, Seldovia, Cook Inlet. 



Staurastrum pygmaeum Breb. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 27 //, length 30 11. 



Staurastrum calyxoides Wolle. (Plate xliii, fig. 31.) 

 In freshwater near Prince William Sound (300). 

 Diameter 10 /x, length 20 /x. 



