356 ASELLID&. 
softer or more sappy portion disappearing more rapidly 
than the more solid parts. Thus it would appear that it 
is necessary that all timber must be somewhat softened 
by the water before they commence their depredations. 
We have been indebted to Mr. H. Pownall for speci- 
mens of the injured timber, and individuals from the 
Southampton Water, extending to woodworks a mile up 
the Itchen river. It appears to: be very general all 
round our coast. It is abundant in the river Dee, and 
the piles supporting the rock lighthouses at New Brighton 
are drilled by them. The late Mr. W. P. Cocks found 
them also in wood cast on shore at Falmouth, and the 
Rev. A. M. Norman has sent it us from the Shetlands. 
