56 



CLASS MOLLUSCA. 



tinned, internally, with rose-colour. The animal attaches 

 itself to rocks, between high and low water mark, and 

 very rarely, if ever, chan.ijes its situation, unless re- 

 moved by accident, when it is driven about by the waves, 

 until the creature, being thrown on a rock in a favour- 

 able situation, attaches itself firmly to the surface. 



The Scaly Chiton, {Chiton squamosus.) 



The Chitons differ so much from all other shell-bearing 

 animals in the arrangement of their shelly covering, 

 that they have been placed by different naturalists in 

 various parts of their system. Lamarck, in referring 

 to these animals, has placed them near the end of the 

 Moll use a. 



Chiton squamosus. 



"Although," says Lamarck, "when we examine this 

 creature, and observe the several pieces of which its shell 

 is composed, attached to the marginal membrane of the 

 mantle which surrounds them, it appears not a univalve, 

 but a raultivalve shell; yet these shelly pieces ought not 

 to be regarded in any other light than as a lengthened 

 shell of one piece, which Nature had originally broken 



