1886. ] The Teredo, or Shipworm. 133 
“The whole of what I have endeavored to describe is found 
only within some hard vegetable substance, either the hull of a 
vessel or boat, a harbor pile, a shipping stage, a floating tree 
* a beacon or buoy,” raft timbers, old spars and masts, 
the planking or bracing of wharves, bridges, &c., &c., and old 
hulks or wrecks. The Teredo bores into these the same asa 
I, outside of one of the shells ; 2, inside ditto; 3-3, pallets ; 4-4, siphons. 
rabbit or mole in the earth, making a continuous gallery or hole 
quite smooth inside and cased or lined with shelly matter form- 
ing the sheath or cylinder above described. This shelly wall or 
lining or cylinder is so fragile that it is quite impossible to split 
wood containing one and get it out or even a portion of any 
Considerable size ; the blow necessary to cleave the wood shatters 
VOL. Xx.—no. 11, to 
a 
