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. 



