402 



SAUNDERS 



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

 Diameter 8-1 2 /i, length lOO//. 



Tetmemorus brebissonii (Menegh.) Ralfs. 



In freshwater near Prince William Sound : frequent. 

 Diameter 23/7., length 78 /i, 



Tetmemorus laevis ( Kuetz.) Ralfs. 



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



Diameter 21-24/i, length 91-100 /^i. The plant is slightly constricted 

 and not at all punctate. 

 Pleurotaenium nodosum (Bail.) Lund. 



Common in a freshwater pond, Popof Island. 



Diameter 40-4^ /i, length 290-325//. 



Pleurotaenium truncatum (Breb.) Naeg. 



In a freshwater pond near Seldovia, Cook Inlet. 

 Diameter 45,", length 216/i. 



Disphinctium cucurbita (Br6b.) Reinsch. 



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

 Diameter 27//., length 67 /i. 



Disphinctium connatum (Brdb.) DeBary. (Plate xliii, fig. 30.) 



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

 men was seen. 



Diameter 24//., length 3S/1. 



Docidium baculum Breb. 



In a freshwater pond, Popof Island. 



Diameter 27//, length 228 /i. 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 a, length 165/-*. 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//.. The plant has two rows of rather long spines. 



