64 



EVENINGS AT THE MICKOSCOPE. 



There are here, you ob-serve, three constituent elements 

 in the pattern. First, a delicate glassy central tooth, 

 tapering to a fine point, and cut into minute saw-teeth 

 along oacli edge. Then a series, of five on eacli side, of 

 similar glassy pointed leaves, bending inward ; .and 

 outside these, on either hand, are a great number of 

 stout dark-coloured hooks, arching forward and inward, ' 

 each notched with saw-teeth, and diminishing in thick- 

 ness as they recede from the centre. 



The manner of using this elaborate organ is no less 

 curious than is its structure. During life it is only 

 the front portion— not more than one-third — of the 



TONGUE OF TROCIIirS. 



ribbon that is in use ; this is spread out on the floor 

 of the mouth, with the teeth projecting and hooking 

 backwards. The remainder has its edges rolled over 

 towards each other, forming a tube closed at its extrem- 

 ity, which, as I have already obsez'ved, is coiled away 

 (in the long-tongued kinds) among the viscera. 



