172 SAUNDERS [408] 



Diameter 27 //, length 54 /*. 



Euastrum elegans (Breb.) Kuetz. (Plate XLIV, figs. 2, 25, 26, 30.) 

 Common in freshwater near Yakutat Bay ; Prince William Sound ; 



Popof Island. 



Diameter 13-15 ,, length 20-30 /*. 



Euastrum affine Ralfs. (Plate XLIII, fig. 32.) 

 In freshwater material from Glacier Bay. 

 Diameter 60 // wide, length 121 ,. 



Micrasterias truncata (Corda) Ralfs. (Plate XLIV, fig. 7.) 

 In a freshwater pond near Glacier Bay. 

 Diameter 92 //, length 97 /* 



Micrasterias oscitans pinnatifida (Kuetz.) Rabenh. (Plate XLIV, 

 fig. 27.) 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 6o/jt, length 60 /j.. Plant is considerably smaller than the 

 measurements given by various authors but agrees perfectly as to shape 

 and markings. 



Micrasterias rotata (Grev.) Ralfs. (Plate XLIII, fig. 25.) 



In a freshwater pond, Prince William Sound. 



Diameter 190 220 /z. The plant varies considerably in the length 

 of the processes on the ultimate division of the semicells. 



Micrasterias denticulata (Breb.) Ralfs. (Plate XLIV, fig. n.) 

 In a freshwater pond near Kukak Bay. 

 Diameter 90 /x, length IIO/JL. 



Micrasterias fimbriata elephanta Wolle. (Plate XLIV, fig. 31.) 

 In freshwater pond near Seldovia, Cook Inlet. 

 Diameter 350 /j, length 350 /./. 



Micrasterias kitchelii Wolle. (Plate XLIV, fig. 23.) 

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 135 /x, length 135^-. 



Sphaerozosma excavatum spinulosum (Del Ponte) Hansg. 

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 8-io/x, length n ;j.. 



Desmidium swartzii Ag. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 35 ft. 



