236 MINUTE MARVELS OF NATURE 



the individuality of the different genera and even 

 species is recognised, so much differentiation of 

 structure beint^- found in the palates of the various 

 molluscs. The contents of the small circle on 





Fig. 157. The small circle 011 Fig. T56 coniains 

 these tei'th 



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 



