152 
PACIFIC SCIENCE, Vol. VII, April, 1953 
Fig. 1. Map of Korean Peninsula showing the five 
main regions and the collection localities (1-16). 
(Heavy broken line indicates railways.) 
are unavailable for the earlier collections by 
Tanaka, Kawamura, and Sato. 
1. Daitaku (cf. Ueno, 1941) (Tai-taik). 
This is a bog lake situated in the moorland 
of the Paik-mo high plateau, Ham-Gyon Puk 
Do. Pelagic (station \d) and littoral {ih) 
plankton were collected. Some microorgan- 
isms were also obtained among the mosses of 
the surrounding swamp. 
2. Lake Fusenko (cf. Ueno, 1941) (Puchon- 
ho). 
This is a gigantic reservoir for the hydro- 
electric plant which has dammed the river 
Puchon-gang, an upper tributary of the river 
Yalu. The collections by A. Tanaka {2h) from 
this lake were obtained during its early stages 
as a lake. 
3. A small pond at Shochudan in Seoul. 
4. A small pool at Shindocho in Seoul. 
5. Eitoho, southwestern suburb of Seoul. 
6. River Kan-ko (the Hang-gang). 
The potamoplankton was collected on the 
river in cross section at Tokuson, southeastern 
suburb of Seoul. 
7. Seiko or West Lake, south of Seoul. 
One of the collections examined was made 
by T. Kawamura (Jo) 5 years before our visit 
{ih). This lake was built artificially about 300 
years ago at the foot of Mt. Reiki, imitating 
the site of Si-hu in Hangchow, China. 
8. Kanggyong. 
Station Sa is a pond with luxuriant growth 
of water weeds among rice fields. Its surface 
area is about 100 square meters. 
Station is an oxbow lake on the mean- 
dering lower reaches of the river Kum-gang. 
9. Lake Kodoho (Kangdong-po). 
This brackish lake of medium area is situ- 
ated near the coast of the Japan Sea. The 
collections were done at three stations, one 
being the center of the lake {9a), the next 
{9h) near "Jichudai,” an island situated south 
of the center, and the last (9c) in the southern 
basin. 
10. A pond near the Sanjippo railway station. 
On the east of the railway station there is 
a small pond with clear water in an area sur- 
rounded by granite rocks. 
11. Lake Sanjippo (Sam-il-po). 
This lake is also situated in the granite area 
and has very clear water. The collection was 
made by using a boat at the southern ex- 
tremity of the lake. 
12. Lake Kanko (Kam-ho). 
This is a small pond which is situated among 
pine forests on the coast of the Japan Sea. 
13. Inner Diamond Mountain (Kumgang 
san). 
The plankton was collected by Kawamura 
from the small pond of the Choanji Temple. 
14. Gan-o-chi. 
This small pond of badly contaminated 
water is historically famous. It is said that 
this pond was built nearly 2,000 years ago in 
