132 



VIEWS OF THE MICROSCOPIC WORLD. 



great num-her of concentric flutings and grooves are discerned, too fine and too near 

 each other to be distinctly counted, which are formed by the edges of the strata ; 

 each line denoting, as is supposed, the margin of each stratum and the different 

 stages of growth in the scale. These flutings are often crossed by others pro 

 ceeding from the central portion of the scale, and terminating at the circumfer 

 ence. The next twelve figures exhibit the structure of the scales of several fishes, 

 most of them well known. In figure 224, is delineated the scale of a species of 



Fig. 225. 



Tig 224. 



