Plate X 
Fig. 1. x13 
Scale of a Dab. weighing fib, shewing distinct 
periods of growth. Age four years. A fine 
specimen of a ctenoid scale. 
Fig. 2. 
This scale shews 21 lines of growth for the first 
year, and 20 lines of growth for the second year. 
Age two years. It illustrates a cycloid scale. 
