406 SAUNDERS 



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

 In freshwater, Popof Island. 

 Diameter 40 /x, length 40 ij.. 



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



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

 Diameter 32-45 p.. length 38-75 /i. 



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

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 16 yu, length 16 //. 



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

 In freshwater ponds near Prince William Sound. 

 Diameter 33 //, length 22 /i. 



Pleurotaeniopsis pseudoconnata (Nordst.) Lagerh. 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 27 /i, length 38 11. 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 ,a, length 100 //, isthmus 40 ix broad. Only one speci- 

 men w'as found and this agrees with Nordstedt's \^x\€(.y 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 ,a, length 21 //. 



Staurastrum dejectum mucronatum (Ralfs) Kirchn. 

 Occurs with the type. 

 Diameter 27 //, 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 .a, length 30 ji. 



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

 In freshwater near Prince William Sound (300). 

 Diameter 10 //, length 20 //. 



