HYBRIDS BETWEEN THE TURBOT AND THE BRILL. 295 
Total length without Length of Greatest height 
caudal in inches. head. of body. 
Turbot i F : 133 é F *349 F ‘ ‘660 
oD ii 5 - 134 c : *339 5 5 ‘688 
Bol 6 3 13% A : "342 3 : *750 
a py a. ae L155 oe oor See ree 
op Vv 5 : 14. a ° 357 ° *732 
aianyl pM darte: 4 143 Aah dae 888 ee ee) 
a AW c : 143 : C 347 0 : 695 
» Vill . : 143 2 3 341 - A *700 
op ix 4 . 143 4 : °336 : C ofl 
oe ay hae iin ps8ad . sea 
op x1 2 15 9 : 358 : 6 “766 
Sexo c 0 153 0 "354 . . 677 
cp Sait 6 : 153 . : *349 ; 5 °730 
Se XL, , 0 163 5 : 333 : : “666 
The details of proportion of brill and turbot given in the above 
table show how easily a diagnosis based on these features alone may 
be vitiated by individual variation ; but, on the whole, the condition 
exhibited by the hybrids appears to be an intermediate one, not 
inclining very strongly to either species. It must be remarked that 
the measurements from which the proportions of the brill and 
turbot are deduced were taken in the fresh condition, but comparison 
of the two series of proportions of hybrid C shows that the 
figures are not greatly affected by preservation in alcohol. The 
variation which is exhibited by the hybrids amongst themselves is 
evidently not greater than is met with in perfectly normal examples 
of either species. 
The fin-ray formula given above is certainly intermediate in 
character, but inclines, among material collected from the same 
locality, rather to the brill than the turbot. Thus nine turbot give 
D. 60—67, A. 42—48; the three hybrids D. 69—76, A. 52—54;; and 
four brill D. 77—81, A. 57—62. The first dorsal ray is in each case 
shorter than the second, as in turbot, but its extremity is divided, 
as in the brill. 
The number of vertebrae is an important distinction between the 
turbot and the brill. The only hybrid in which I have counted 
these structures agrees in this respect with the last-named species. 
In certain minor characters of doubtful importance the hybrids 
appear to be intermediate. The vomerine teeth are rather more 
numerous in the brill than in the hybrids, and much more numer- 
ous than in those turbot which I have examined. In the teeth of the 
upper jaw the hybrids agree best with the brill, the teeth being 
more slender than those of the turbot. The peculiar papillation 
of the lips is probably a very variable character. Such turbot 
as I have examined have an outer row of semicircular pigmented 
labial tags or papilla ; this feature was slightly represented in the 
NEW SEBRIES.—VOL, III, NO, IV. 24 
