NOTE. 
The size of the scales as shown on the Plates is no indication 
of their real size. The magnification is specified on each Plate. 
Plate IV., Figure i, illustrates the smolt stage of a Salmon 
before its first migration to the sea. 
Plate IV., Figure 2, shows the Grilse stage, the fish having- 
passed one winter in the sea. 
Plate V., Figures 1 and 2, show scales from Maiden Fish at 
various ages, returning to the fresh water for the purpose of 
spawning for the first time. 
Plate VI., Figures 1 and 2, show the scales of Fish after 
spawning. Fish in this stage are called Kelts. 
Plates VII., Figures 1 and 2, are scales of Salmon which have 
spawned and recovered in the sea, and are returning to the river 
to spawn again. 
Plate VIII. is the scale of a Fish which has spawned four 
times, caught when descending the river after its fourth spawning. 
Plate IX., Figure 1, is the scale of a large Irish Lake Trout. 
Plate IX., Figure 2, is the scale of a Rainbow Trout from New 
Zealand, showing a spawning mark. 
Plate X., Figure 1. Scale of a Dab with Ctenoid edge. 
Plate X., Figure 2. Scale of a Haddock, showing Cycloid 
edge. 
Plate XI., Figure 1. Otoliths of a Plaice. 
Plate XI., Figure 2, shows the difference in size between the 
Otoliths of a Cod and of a Salmon. 
EXPLANATION OF LETTERING ON THE PLATES. 
C.—Centre of growth. 
R. L.—River Life. 
W.l.—First Winter in sea. 
W.2.—Second Winter in sea, 
W.3.—Third Winter in sea, 
S. M,—Spawning Mark. 
