38 



CLASS MOLLUSCA. 



In an early age the projecting claws of this shell are 

 very small, so that its appearance is materially different 

 from that which it assumes at a more advanced period of 

 its growth. It is known as the Spotted Scorpion-Shell, 



Plcroccra Scorpio. 



and is distinguished from other species of the same 

 genus, hy the knotted and granulated appearance of its 

 surface ; the opening of the shell is long and narrow, 

 and of a dull violet red, sometimes hrownish, on which 

 numerous transverse wrinkles are seen, either of a pure 

 white, or slightly tinged with yellow. 



F AM I L Y CA NA LI FEU A. 



The shells helonging to this family agree with those of 

 the last in having a canal at their base ; but the lip to 

 the right of the opening does not change its form through 

 age. 



