1 66 SAUNDERS [4 02 ] 



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

 Diameter S-I2/*, length ioo/*. 



Tetmemorus brebissonii (Menegh.) Ralfs. 



In freshwater near Prince William Sound: frequent. 

 Diameter 23^1, length 78^. 



Tetmemorus laevis ( Kuetz.) Ralfs. 



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



Diameter 21-24^, length 91-100 p. 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 290-325^. 



Pleurotaenium truncatum (Brb.) Naeg. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 45^5 length 216^. 



Disphinctium cucurbita (Brb.) Reinsch. 



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

 Diameter 27^, length 67^1. 



Disphinctium connatum (Bre"b.) DeBary. (Plate XLIII, fig. 30.) 



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

 men was seen. 



Diameter 24^, length 38^. 



Docidium baculum Brb. 



In a freshwater pond, Popof Island. 



Diameter 27^, length 228 /*. 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^, length 432^. 



Docidium dilatatum (Cleve.) Lund. 



In a freshwater pond, Popof Island. 



Diameter 13^, length 165 y.. The plant has five pearly granules 

 at each end. 



Docidium gracile Wittr. 



Triploceras gracile BAIL. Micr. 



Common in fresh water near Prince William Sound. 

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



