US 



were, in the course of a few months, made so full of holes, that they could be 

 beaten to pieces with only a little force. Although, when the mud was scraped 

 off, the perforations did not appear much larger than to admit a pin's head, 

 yet the piles, on being split lengthwise, were found to be full of large passages, 

 or hollow cylindrical ducts, each of which contained a worm, enclosed in its 

 testaceous tube, which it exactly fitted. The most efficacious method which 

 has hitherto been discovered, to preserve timber from the ravages of these 

 worms, is that which is now adopted in the several dock-yards, — to cover all 

 the parts under water with short, broad-headed nails: these soon cover the 

 whole surface with a strong coating of rust, which is found to be altogether 

 impenetrable to the animal. 



The generic name is derived from rs^iu, to bore. 



Scientific name. Locality. Scientific name. Locality. 



Gigantea, Sumatra, Ceram. Ultriculus, Wood in the Sea. 



Navalis, Sides & bottom of ships. Clava, Coromandel. 



