1 66 SAUNDERS [4 02 ] 



Very abundant in freshwater pond near Seldovia, Cook Inlet (424). 

 Diameter 812/4, length ico/x. 



Tetmemorus brebissonii (Menegh.) Ralfs. 



In freshwater near Prince William Sound : frequent. 

 Diameter 23 //, length 78 PL. 



Tetmemorus laevis ( Kuetz.) Ralfs. 



In a freshwater stream, Virgin Bay (300) ; Yakutat Bay. 



Diameter 2124/4, length 91 loo/x. The plant is slightly constricted 

 and not at all punctate. 

 Pleurotaenium nodosum (Bail.) Lund. 



Common in a freshwater pond, Popof Island. 



Diameter 40-45^, length 290-3 25 /x. 



Pleurotaenium truncatum (Brb.) Naeg. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 45//, length 216/4. 



Disphinctium cucurbita (Breb.) Reinsch. 



In a freshwater pond near Prince William Sound (302). 

 Diameter 27 AS length 67^. 



Disphinctium connatum (Br6b.) DeBary. (Plate XLIII, fig. 30.) 



In a freshwater pond near Seldovia, Cook Inlet. Only one speci- 

 men was seen. 



Diameter 24/4, length 38/4. 



Docidium baculum Breb. 



In a freshwater pond, Popof Island. 



Diameter 27^, length 228/4. The plant is slightly wider than the 

 description given, but is not at all narrowed as are the other species. 



Docidium coronulatum Grun. 



In a freshwater pool near Kukak Bay. 

 Diameter 40/4, length 43 2/4. 



Docidium dilatatum (Cleve.) Lund. 



In a freshwater pond, Popof Island. 



Diameter 13/4, length 165/4. The plant has five pearly granules 

 at each end. 



Docidium gracile Wittr. 



Triploccras gracile BAIL. Micr. 



Common in fresh water near Prince William Sound. 

 Diameter 27^. The plant has two rows of rather long spines. 



