36 



THE BOTANICAL .MAGAZINE. 



[Vol. XXV. Xo. 2S9. 



Teganuma lies about 30 miles to the northeast of Tok^^o, 

 and is situated in the northern part of the Chiba prefecture. Its 

 longer axis is nearly parallel to the River Tone to which the 

 swamp is connected by an aqueduct in its eastern part to 

 drain the swamp into the river and to prevent the inflowing 

 of the river into the swamp. 



XVDOOO * 



Fig. 1. 



Tega-Swanip and its vicinity indicates llie inner margin of 



littoral flcira. 



The swamp is about 12 km in length, and runs from east 

 to west, and is about 0.65 km in breadth. It bends south- 

 ward and widens in its eastern end, being about 2.3 km from 

 north to south and about 1.3 km from east to west. 



Five principal brooks flow into the swamp. Two of them 

 that flow into the swamp at its northwestern corner come 

 from the neighbourhoods of the villages Judayu and Shorenji. 

 Another brook on the southwestern side is a little larger than 



