172 SAUNDERS [408] 



Diameter 27 n, 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 ^t, length 20-30 [i. 



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

 In freshwater material from Glacier Bay. 

 Diameter 60 ij. wide, length 121 n. 



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

 In a freshwater pond near Glacier Bay. 

 Diameter 92 /x, length 97 [i. 



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

 fig. 27.) 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 60//, length 60 ^i. 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 //. The plant varies considerably in the length 

 of the processes on the ultimate division of the semicells. 



Micrasterias denticulata (Breb.) Ralfs. (Plate xliv, fig. 11.) 

 In a freshwater pond near Kukak Bay. 

 Diameter 90 /x, length iio/x. 



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

 In freshwater pond near Seldovia, Cook Inlet. 

 Diameter 350 /x, length 350 lu 



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

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 135 At, length 135 /x. 



Sphserozosma excavatum spinulosum (Del Ponte) Hansg. 

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 8-10 /x, length 11 ^i. 



Desmidium swartzii Ag. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 35 fi. 



