IN CEYLON. 
limited to the upper part of Hinidunkanda, a hill in the 
Southern Province some 2,200 feet high. The upper part of 
this hill is for the greater part of the year enveloped in 
clouds, and it is only between 1,500 and 2,000 feet that this 
species occurs. It is particularly abundant, together with 
D. qusesita, on the north-west flank, and is entirely absent 
from the eastern part of the hill. The species D. acuta and 
D. attenuata are the next in point of rarity, they being 
limited to the low wet country between Hinidunkanda and 
Pitigala. Both species occur in abundance in the damp 
forests of Wewella, Pasdun korale, and D. acuta extends to 
the Wirakanda forests near Hewessa. 
The remaining wet zone species — D. pruriens and D. 
qusesita—occur in the wet forests of Karawita, Sinha Baja, 
Hiniduma, and Yagirala. D. pruriens reaches its maximum 
dimensions and is most abundant in the forests of the 
Adam’s Peak Wilderness, and thrives best on the reeky soils 
in the vicinity of Magala, Kadawatta, and Eratna, where the 
rainfall is very heavy. 
In the intermediate zones, where the rainfall varies from 
70 to 80 inches, the whole of the dry zone species, excepting 
D. Melanoxylon, occur, but of the wet zone species, however, 
only two — D. Gardneri and D. sylvatica—occur. 
Intermingling of Dry and Wet Zone Species. 
One rarely meets with any of the thirteen species of the 
wet zone in a purely dry zone. D. Moonii, a species pos¬ 
sessing relatively thick fleshy leaves, is reported from dry 
plaees along the coast, though it is most characteristic of 
districts where the rainfall is great. Again, D. insignis, a 
species generally distributed in the wet zone, occurs in the 
Pindeniya and Kegalla districts. None of the wet zone 
species have ever been reported from the arid zones of the 
Island. 
On the other hand, at least two of the dry zone species — 
D. Ebenum and D. Embryopteris — constantly recur in 
