110 Beautiful SMIs. 



are mysteries. The most common of tlicm^ perlicps, 

 is tlie Prickly Pidduck^ or Peckstone (P. dactyhis), 

 wliick is mucli used by the fisliermen of our coasts 

 as bait ; tlie specific name is tke Latin for a fruit 

 shaped like a finger^ -wliicli is something like the 

 shape of this mollusk, as Tvill bo seen by the 

 annexed engraving. 



Tlio genus PJioJus is very vridely distributed, 

 and all the species have the same boring habits as 

 those of our own coast., which we need not enume- 

 rate. Like them, too, in this respect, are tha 

 marine worms called Teredo, wliich make their way 

 into the bottoms of ships, and all submerged timber, 

 but these will be more fully spoken of in another 

 volume. The above figure exhibits the Pholas dac- 

 iylus as it appears in a section of rock, split open 

 for the purpose of seeing the shelly miner at his. 

 work* 



