294 HYBRIDS BETWEEN THE TURBOT AND THE BRILL. 
Total length. Total without caudal. Length of head. Greatest height. 
A. 173iny! poy lding so eae Pl eaten 
B. 182 in. - l5iin.. 47 in, 5 92 in. 
C (preserved) 182 in. 5 1513 in. . 5 in. - 102 in. 
C (fresh) LOMin’ : 16 in. 3 5 in. 0 103 in. 
Fin-ray Formula : 
A. : 2 D. 69 : : A. 52. 
B. : : D. 72 : : A. 54. 
C : D. 76 : - A. 54, 
Comparative.-—The foregoing description will probably sufiice, 
minor details of character being more conveniently treated only in 
comparison to those of the species to the union of which the forms 
before us have been imputed. It may at once be said that all three 
examples are females, but not one of them is sexually mature. It 
is significant that all three were caught in the month of June, a 
period at which the ovary would certainly be enlarged (or evidently 
recently shotten) in either brill or turbot, and fish of either species 
as large as those before us (viz. 173 to 19 inches) would as a rule 
be sexually mature. In fact, an immature female brill of even the 
smallest size quoted is decidedly rare. Apart from the scales, turbot 
and brill are most readily distinguished by the proportion borne by 
the height to the length of the body, the turbot beig the deeper 
fish of the two. The proportions laid down in ichthyological works, 
however, are of no great service, since the size of the individuals 
on which such proportions are based is never forthcoming, and it is 
well known that the proportions of a fish are subject to constant 
change with the growth. Therefore, in comparing our supposed 
hybrids with the brill and turbot, it appeared best to give the pro- 
portions of a series of forms of either species agreeing as nearly as 
possible with them in size, as in the appended table. The total 
length, without the caudal, given in the first column is taken as 
the unit, and the other dimensions are expressed in decimals of this 
unit, 
= ee $$ 
Total length without Length of Greatest height 
caudal, in inches. head. of body. 
Hybrid A eye wy. she BBO a Scr EROSS 
eB ne mee ee HN Se ese bia ceed 
it ar GLAS SM Thierry ahr y BESiG Aiwa. HEBG 
rp Wap ; 4 16 : 5 *312 : . *656 
Brill i See Ase Fe er 358 eS Mem G 7S 
py 5 5 1 C : "295 ; : “608 
Send 6 : 11 5 : "295 : : 586 
SLY, 9 : 114 ° - ‘288 ° 4 “600 
rs Vv : ° 1 é 3 "295 ¢ . °675 
me 0 9 12 3 5 eZ Oil : 6 562 
py htt : : 143 C ; *302 . 9 O71 
5 Vili ut alse aloe = 2 wEB06 er DIG 
UX : : 16 ; ¢ *281 . . 562 
“* Fresh, Preserved in alcohol. — 
