256 



SALMONID^ OE BRITAIN. 



Marcli 9th, 1882, or in 75 days. In due course the fry were removed to a planked 

 pond at Howietoun, 20 ft. long by 5 ft. wide, and 1| ft. deep. Through this a 

 stream flows, entering at its upper and making its exit at the surface at its lower 

 end. On Nov. 15, 1882, we examined them, and the largest fish was 4| inches 

 in length. 



B. X, D. 13 (tV), P- 13-14, V. 9, A. 11 (f), 0. 19, L. 1. 116-118, Csocal 

 pyl. 61-78. 



The length of the heads of these hybrids were about i, and of pectoral fins from 

 5-|- to 6f in the total length of the fish.* The maxilla in these fish extends pos- 

 teriorly to beneath the hind third of' the eye. The preopercle has a distinctly 

 oblique lower limb in no. 1, but it is less strongly marked than in no. 2, while 

 merely a simple curve exists in nos. 3 and 4. The csecal appendages were 

 examined in two, one (no. 3) had 78, the other (no. 4) had 61 : and when 

 hybrids between the same parents show such variations, it demonstrates the 

 inconstancy in the number of these appendages. Colours — were nearly identical 

 in all, from 12 to 13 par bands and the sides closely sprinkled with small black 

 spots and a few red ones ; some black spots on the head, while in all the front 

 upper edge of the dorsal fin was white with a dark intramarginal band,-)- and 

 from 11 to 13 black spots on or between the rays. In November, 1883, three 

 more of these fish were captured, which measured in length 6 '4, 6 '7, and 

 7'3 inches respectively,^ while the numbers were supposed to be about eight 

 hundred. In these three specimens the number of par bands along the sides varied 

 from 10 to 12, while the direction of the rows of scales showed great irregularity, 

 and those between the adipose dorsal fin and the lateral-line varied from 12 to 14. 



On March 13th, 1884, these hybrids, numbering 212, the largest six being over 

 10 inches in length, the majority smaller, while a few did not exceed 2^ inches, 

 and all apparently in excellent health, were transferred to the octagon pond at 

 Craigend, the diameter of which is 20 ft., and its depth 4 ft. ; its sides and bottom 

 are planked, while the stream which supplies it flows in at about 1 ft. below the 



No. 1. No. 2. No. 3. No. 4. 



Inches. Inches. Inches. Inches. 



* Length of example ... 4-3 . 3-4 . 4-1 . 4-0 



„ „ head ... 0-9 . 0.7 . 0-8 . 0-8 



„ „ pectoral fin . . 0-8 . 0.6 . 0-6 . 06 



„ from snout to base of dorsal 1-7 . 1'4 . 1-7 . 1'6 



„ „ „ „ caudal 3-8 . 3-0 . 3-6 . 34 



Diameter of eye ... 0-2 . 0-15 . 0-2 . 0-2 



From end of snout . . 0'25 . 0-2 . 0'2 . 023 



Apart 0-3 . 0'27 . 0-3 . 0-3 



Height of body .... 0-8 . 0-65 . 0.7 . 0-7 



t As no white dark-based edging exists on the anterior superior edge of the dorsal fin in the 

 Lochleven trout bred at Howietoun, but is present in most burn-trout, this forms another link in 

 the chain of facts, that these two forma of trout are merely varieties of one species. 



} Length of example 



,, „ head . 



„ „ pectoral fin . 



„ „ caudal fin . 



„ from snout to base of dorsal fin 



,, }» ,, ,, caudal ,, 



Diameter of eye . 

 From end of snout 

 Apart .... 

 Height of body ... 



No. 1. 

 Inches. 

 . 7-3 

 . 1-6 

 , 1-05 

 , 1-3 

 2-8 

 , 6-2 

 . 0-3 

 . 0-5 

 . 0-6 

 , 1-5 



No. 2. 

 Inches. 

 5-7 

 1-2 

 1-0 

 0-9 

 2-2 

 4-9 

 0-23 

 0-33 

 0-4 

 1-2 



No. 3. 

 Inches. 



5-4 



1-15 



0-9 



0-9 



2-2 



4-6 



0-25 



0-3 



0-4 



1-0 



Specimen No. 1, had the teeth in a double row along the body of the vomer, scales in irregular 

 rows in places, the upper two-thirds of the body spotted with black, some large red spots along 

 the lateral-line, three black spots on the opercle and a fourth at its upper corner, one on pre- 

 opercle, twelve par bands along either side. Dorsal fin gray with a white edge at its upper 

 anterior margin, the lower half of the fin spotted with black ; adipose dorsal orange with a gray 

 front edge. Specimen No. 2, nearly similar but a little more yellow, and with ten par bands on 

 one side, twelve on the other. Specimen No. 3, had ten par bands on one side and eleven on the 

 other, many red spots on the body. 



