-IV.] 
DRIFTWOOD FROM THE YENISEJ. 
199 
great mass of the driftwood which the river bears along, 
however, does not remain on its own banks, but floats 
out to sea to drift about with the marine currents until 
the wood has absorbed so much water that it sinks, or 
until 'it is thrown up on the shores of T^ovaya Zemlya, the 
north coast of Asia, Spitzbergen or perhaps Greenland. 
B 
EVERTEBRATES FROM PORT DICKSON. 
A. Yoldia arctica Gray. One and two-thirds of natural size. b. Diastylis Rathkei Kr. 
Magnified three times. 
Another portion of the wood sinks, before it reaches the sea, 
often in such a way that the stems stand upright in the river 
bottom, with one end, so to say, rooted in the sand. They may 
thus be inconvenient for the navigation, at least at the shallower 
places of the river. A bay immediately off' Port Dickson 
