172 SAUNDERS 



Diameter 27 /*, length 54 /x. 



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 fj. wide, length 121 p.. 



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 60 /x, length 6o//. 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 190-220/1. The plant varies considerably in the length 

 of the processes on the ultimate division of the semicells. 



Micrasterias denticulata (Bre"b.) Ralfs. (Plate XLIV, fig. n.) 

 In a freshwater pond near Kukak Bay. 

 Diameter 90 //, length 



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^, length 135^. 



Sphaerozosma excavatum spinulosum (Del Ponte) Hansg. 

 In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 8-io/^, length n ,u. 



Desmidium swartzii Ag. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 35 p. 



