SAUNDERS [48 



Diameter 27 //., length 54 p. 



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 p.. 



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

 In freshwater material from Glacier Bay. 

 Diameter 60 n wide, length 121 p. 



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

 In a freshwater pond near Glacier Bay. 

 Diameter 92 //, length 97 p.. 



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

 fig. 27.) 



In a freshwater pond near Seldovia, Cook Inlet. 



Diameter 6o//, length 60 p.. 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 1 90-220 /i. The plant varies considerably in the length 

 of the processes on the ultimate division of the semicells. 



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

 In a freshwater pond near Kukak Bay. 

 Diameter 90 /*, length no p.. 



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

 In freshwater pond near Seldovia, Cook Inlet. 

 Diameter 350 /*, length 350 /*. 



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

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 135 p., length 135 p.. 



Sphaerozosma excavatum spinulosum (Del Ponte) Hansg. 

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 8-10^, length n p.. 



Desmidium swartzii Ag. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 35 p.. 



