SHELLS AND MOLLUSCOUS ANIMALS, 235 



is naturally of a green colour, but can change itself 

 to a dull brown hue. It is so rapid in its flight, 

 that it is often compared to a flying-fish ; while 

 an allied species has received the name of Sagitta 

 from its arrow-like movements. Our common 

 pen-fish is called by fishermen the sleeve, or hoe- 

 fish, and is a valuable article for bait. It is said 

 that one half of the cod of Newfoundland is 

 caught by its use. On those chilly shores it is 

 found in abundance in the early part of the month 

 of August. The Capelin the fish which is used 

 for bait when this is not in season is at this time 

 not to be found, so that the two kinds of bait alter- 

 nately serve as a supply to the fishermen. Hun- 

 dreds of tons of these animals are thrown up during 

 the stormy weather on the flat beaches, where they 

 lie in a decomposing mass, emitting an insufferable 

 effluvium, and the cod is considered to be in the 

 best condition when it has fed upon it. 



The beautiful Nautilus, or Argonaut, belongs to 

 the Cephalopod tribe, though its shell is not internal, 

 but forms for it a light and elegant dwelling. 



