132 VIKWS 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. 



Fig 284. 



