170 SAUNDERS [406] 



Cosmarium broomei Thwaites. (Plate XLIII, figs. 26, 35, 36.) 

 In freshwater, Popof Island. 

 Diameter 40 /a, length 40 ft. 



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



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

 Diameter 32-45 n, length 38-75 p. 



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

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 16 //, length 16 p. 



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

 In freshwater ponds near Prince William Sound. 

 Diameter 33 ft, length 22 /*. 



Pleurotaeniopsis pseudoconnata (Nordst.) Lagerh. 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 27 //., length 38 ft. 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 65 //., length 100 ft, isthmus 40 /JL broad. Only one speci- 

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



Pleurotaeniopsis ralfsii (Breb.) Lund. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 54 /*, length 70 //. 



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



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

 Diameter 21 //., length 21 p.. 



Staurastrum dejectum mucronatum (Ralfs) Kirchn. 

 Occurs with the type. 

 Diameter 27 /*, length 2^ ft. 



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 p. 



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

 In freshwater near Prince William Sound (300). 

 Diameter 10 ft, length 20 ft. 



