48 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
CHANGES AVITH AGE. 
The young of the fish differs so strikingly from the adult that it would readily 
be referred to another species or genus. The more striking changes with age occur 
in the relation of depth to length, in the relative size of the eye. in the color, and in 
the shape of the caudal fin. The smallest secured came from the head of Narragansett 
Bay ; it is 25 mm. long to the base of the caudal. The greatest depth is beloAV the 
Fig. 1. — Smallest specimen, 32 mm. long, Indian Point, July 5, 1900, showing color pattern in deeper layer of skin. 
Fig. 2. — Specimen 41 mm. long, Indian Point, July 5, 1900, showing color pattern. Color entirely in deeper layer of skin. 
Fig. 3. — Specimen 70 mm. long, Indian Point, July 5, 1900, showing addition of color cells between those grouped into bars- 
Fig. 1. — The left side of a specimen 95 mm. long, Wareham, August 9, showing indistinct bars and oblique streaks. 
Fig. 2. — The right side of the same specimen with the outer skin removed and showing the bars made less distinct than 
in younger specimens by the appearance of numerous color cells between them. No evidence of oblique streaking, 
which is entirely due to color cells in the outer layer of the skin. The blood vessels are surrounded by pigment cells 
and show as black lines. 
first dorsal spiue and measures 8 mm. The average depth in 10 individuals from 
the same place, with an average length of 29.2 mm., is 8.7 mm., or 29.4 per cent of 
the length. The average width is 4 mm., or 13.7 per cent. 
In 7 specimens from the same place, taken at the same time, ranging from 46 to 
60 mm., and with an average length of 50.6 mm., the depth averages 13.14 mm., 
or 25.96 per cent; the width 5.71 mm., or 11.08 per cent. In 3 specimens from 
