- 
of the Fishery Board for Scotland. 125 
| 1A 2A. 
| Species. z ‘ : = 
| Vari-| y,: : Vari-| a>: 
Max. | Av five Min. | Max. | Av. api Min. | 
G. luscus ae He = ie 45 | 39°8| 40 37 17 | 15 45 12 
G. minutus... or Bi a 35 | 3 42 28 18 | 155 | 34 13 | 
G. esmarkii Pee pe), 1 31 | 27-7 | 71 | 25 | 19 | 167 | 47 | 14 | 
The base of the first anal fin is measured from the hind edge of the 
anus to the end of the base of the fin. 
Various relationships between the lengths of the fin-bases may be made 
out by inspection of the averages. ‘Take, for example, the ratio between 
the lengths of the anal fins :— 
In luscus the first anal bears to the second anal the ratio of 40: 15, 
WOeG TOF 
In minutus the corresponding ratio is 31 : 15°5, ve, 2: 1, 
In esmarkii the corresponding ratio is 28 : 17, 7.¢., 5:3. 
From these data, then, it might be expected that a specific character 
could be obtained in the relation between the two anal fins. To test its 
value from the point of view of specific description it is necessary to find 
what ratios are found ina number of fish. These are set out below. The 
various ratios found existing between the anal fins in respect to the length 
of their bases is set out for each species, and the frequency with which 
each occurred in the sample of fish is also added. 
Ratios of the 
Bitcknal to ereeney hae ened 
Usaneee G. luscus. | G’. minutus.) G.esmarkii. 
a3) aa! 1 
ole k a 
4 ah 1 
ee 2 
29) eat 2 
DiGacod ef 
vip Rotor | Fi | 
2G sl 6 al | 
Bedi L 12 1 
righ aia 4 che 
7 are el | ] iT 
7] Wee | i 2 i 
2 Sl 8 ] 
EO RBe Cn] 3 
i ete rea 7 9 | 
a eae 3 | 7 
Dies 13 
AI ae n 
iberone il is 9 
_ pe ae as = at | we BUN) | 
Total 44 33 47 | 
