236 MINUTE MARVELS OF NATURE 



the individuality of the different genera and even 

 species is recognised, so much differentiation of 

 structure being found in the palates of the various 

 molluscs. The contents of the small circle on 



Fig. 157. The small circle on Fig. 156 contains 

 these teeth 



Fig. 156 I have photographed under considerably 

 greater magnifying power (Fig. 157) to show the 

 structure and arrangement of this marvellous 

 dental display. These teeth are translucent, 

 silicious, glossy, and beautiful to look upon when 

 illuminated and seen under the microscope. 

 Some species remind you of row upon row of 



