SAUNDERS L46J 



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



In freshwater, Popof Island. 



Diameter 40 /*, length 40 ft. 

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



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



Diameter 32-45 ft, length 38-75 ft. 



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



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 16 /*, length 16 ft. 

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



In freshwater ponds near Prince William Sound. 



Diameter 33 /*, length 22 ft. 



Pleurotaeniopsis pseudoconnata (Nordst.) Lagerh. 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 27 /a, 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 /z, length 100 /z, isthmus 40 /z broad. Only one speci- 

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



Pleurotaeniopsis ralfsii (Brb.) Lund. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 54 //., length 70 ft. 



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

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

 Diameter 21 /*, length 21 ft. 



Staurastrum dejectum mucronatum (Ralfs) Kirchn. 

 Occurs with the type. 

 Diameter 27 /z, length 27 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 ft. 



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

 In freshwater near Prince William Sound (300). 

 Diameter 10 /z, length 20 ft. 



