1903-4.] Mr Calderwood on Bull Trout of Tay and Tweed. 37 
common amongst large examples; the tail is thick, short, and 
clumsy. The male of 12 £ lbs. represented in the photograph has 
not this stunted tail. The Tweed trout is not often found of 
greater weight than 15 or 16 lbs. The heaviest fish of which I 
can find any record is one of 22 lbs., said to have been caught at 
Cornhill boat-house in either 1841 or 1842 (William Rochester, 
Tweed Salmon Reports , 1866, p. 102). 
The caudal peduncle is, trout-like, comparatively broad, varying, I 
find, in the proportion of 12 to 13^ times the total length of the fish. 
In the finer-tailed salmon this measurement gives 13 J to 15 times. 
The fish appears to retain its teeth on the shaft as well as on 
the head of the vomer to a more advanced age than is the case in 
the ordinary sea trout. No gill maggots were present in the fishes 
examined. 
The following are particulars of a few selected specimens : — 
No. 1. 
Length 31" x 6f" (79'2xl7'5 cm.); 
weight 13 lbs. 
Head 16 '7 cm. 
Eye to post, margin of gill cover 
9 ’6 cm. 
Vomer teeth absent. 
Scales 14/14. 
Tail truncate; caudal peduncle 6’6 cm. 
Fins, D 12, P 13, A 10. 
No. 2. 
Length 31J"x6§" (80‘4 x 17 cm.); 
male ; weight 13 lbs. 3 oz. 
Head 17*0 cm. 
Eye to gill cover 9*6 cm. 
■ Scales 12/13. 
Fins, D 11, P 13, A 10. 
Tail truncate ; caudal peduncle 6 *5 
cm. 
No. 3. 
Length 30" x 6| (76’5 x 17 cm.); 
male ; weight 12| lbs. 
Head 16*0 cm. 
Eye to gill cover 9 *0 cm. 
Teeth, two on head of vomer. 
; Scales 13/13. 
Tail markedly truncate (2*2 cm.) ; 
caudal peduncle 6 ’2 cm. 
iFins, D 12, P 13, A 11. 
The specimen photographed. 
No. 4. 
Length 26"x5f" (66'3xl4'6 cm.) 
female ; weight 7 \ lbs. 
Head 11*7 cm. 
Eye to gill cover margin 7‘1 cm. 
Teeth, two on shaft and two on head 
of vomer. 
Scales 14/14. 
Tail truncate; caudal peduncle 5 ’0 cm. 
Fins, D 12 (very distinct), P 12, 
A 10, V 9. 
Specimen photographed. 
No. 5. 
Length 18"x3§" (46x10 cm.); 
weight 2 \ lbs. 
Head 8 '5 cm. 
Eye to gill cover 5*0 cm. 
Teeth, 3 on shaft and also on head of 
vomer. 
Scales, R 13, L 11. 
Fins, D 11, P 12, A. 10. 
No. 6. 
Length 18"x3§ (46 x 9'2 cm.); 
weight 2 lbs. 10 oz. 
Head 8 *6 cm. 
Eye to gill cover 4*9. 
Teeth all along shaft of vomer and on 
head. 
Tail very slightly forked. 
