58 Part ITT.—Twenty-fourth Annual Report 
The earstones of the mackerel are comparatively small. The one 
represented by figure 36 is from a fish of average size and about 3‘Omm, 
in length. It has a general resemblance to the earstones of the herring, 
being narrow, with the sides parallel, the posterior end obtusely rounded 
and unequally bifurcated in front, the lower branch being produced into 
a narrow-pointed extremity. 
Fam. Gospiup2. 
Genus Gobius. 
Gobius niger, Linn. The Black Goby. PI. ii. B., figs. 19 and 2); pl. 
v., fig. 6. 
In this species the earstones are large in proportion to the size of the 
fish, and their broadly rhomboid form is so unlike that of the earstones 
of any of the other kinds of fishes examined that they appear to be 
characteristic of this particular species and to indicate that it might be 
possible to identify the fish almost entirely by the earstones. 
The two fishes from which the earstones shown on PI. ii. B. were 
obtained measured 105mm. in length, and their earstones are about 4mm. 
long by tully 3mm. in width. These earstones are thus about equal to 
one twenty-fifth part of the length of the fish. 
Gobius minutus, Gmel. The Speckled Goby. PI. ii. B., figs. 21-24, 
The largest of the four fishes represented by the earstones shown on 
pl. il. B., figs, 21 to 24, measured about 3 inches in length. The other 
three were smaller, the largest being 54 and the smallest 43mm. The 
earstones of the larger specimen were obscurely quagrangular in form and 
measured about 2°2mm. across the longest side, the width being slightly 
less. ‘Ihe earstones of the other specimens were very small, and 
resembled minute circular discs, the largest being little more than 1mm. 
in diameter. 
Fam, CAaLLIONYMID2. 
Genus Callionymus. 
Callionymus lyra, Linn. The Dragonet. PI. iii. B., figs. 10-14; pl. 
v., figs. 10 and 11. 
The earstones of the dragonet are very small, and they are subovate in 
outline; the lower margin is nearly straight, but the upper is boldly 
arcuate. The posterior end is rather blunt, but the anterior extremity 
ends in most of the specimens in a short point. In some of them it is 
slightly bifid, and the upper margin is also obscurely crenulated. 
The earstones of five fishes of different sizes are shown on plate ill. 3. 
The fishes measure 10 inches, 8} inches, and 7? inches in length, while the 
length of other two (figs. 13 and 14) is doubtful. The earstones of the 
largest fish are about 3mm. long, which is equal to about one eighty- 
fourth part of the entire length of the fish. The earstones of the others 
are somewhat smaller and rather more pointed at the extremities. 
Callionymus maculatus, Bonap, The Spotted Dragonet. PI. iii. B., figs. 
1-9; plate v., figs. 18 and 24. 
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