Notes. 
465 
marine Monocotyledon, growing abundantly in the shallow sea 
between the islands of Irumuti and Uchibanari. Many specimens 
bearing ripe fruit at the apex of the spirally-wound peduncle, were 
secured. These proved on examination to be Enhalus ac oroides, Steud. 
(E. Koenigii, Rich.), a peculiar genus of Hydrocharideae, found in 
Malayan seas, and extending to Africa in the west, the Pacific Ocean 
in the east, and to Australia in the south. The linear dark-green 
leaves of this plant, which attain the size of more than 60 cm. by 
1-1J cm., afford sufficient food to the Dugongs (Halicorne Dugong ), 
which frequent the shallow sea of the Luchuan Islands. Some of 
the specimens of Enhalus in my collection have the leaves partly 
bitten off by the herbivorous mammal, the skulls and teeth of which 
I brought home for identification, and the flesh of which I tasted and 
found delicious. The Luchuan name of Enhalus is ‘ Susanuha/ 
In the same sea, growing together with Enhalus, I also found 
Halophila ovata, Gaudich. (E ovalis, Hook, f.), in abundance. This 
plant is now known to extend to the Pacific coasts of the principal 
island (Hondo) of Japan; and I collected it myself in 1896 at a depth 
of between eight and eighteen fathoms in the Bay of Kagoshima, in 
Kiusiu in Southern Japan. 
There is a specimen, collected by me in the sea of Miyako-jima, 
of another marine Monocotyledon, which, I think, might possibly be 
referred to Thalassia stipulacea , Koen. 
TOKUTARO ITO, Tokyo. 
RHIZOPHOREAE IN JAPAN. — Having paid attention to this 
subject for the last six years, I think it well to put on record 
three species of Mangroves now ascertained to be indigenous to Japan. 
They are Kandelia Rheedii, Wight et Arn., Bruguiera gymnorrhiza , 
Lam., and Rhizophora mucronata, Lam. In the island of Kiusiu in 
Southern Japan, only the first of these species is to be found; in 
Amami Oshima, we have the first two species; while, in Uchina 
(Okinawa or Great Luchu) and in the Yayeyama Archipelago, all 
the three species are to be found together in luxuriance. Thus the 
northern limit of Mangroves in Japan might be attributed to the 
coast of Kiire in the Bay of Kagoshima in Kiusiu, and extending 
through Amami Oshima and Uchina to the Yayeyama Archipelago, 
where I found them as flourishing as those on the Malayan coasts. 
