1S()8.] DEVELOPMENT OK THK SALMON. 251 



February 1863. No. 1 is a male (by examination) ; of No. 2 tlie 

 sex cannot be stated. 



The coloured figures best display the tints and markings ; but for 

 the sake of precision I shall describe each separately. No. 1, it 

 may be observed, has been drawn from the dead specimen, and 

 hence it appears paler than during life ; this, however, rather in- 

 creases its Salmon-like characters. No. 2 has been drawn from life 

 (2.5th March, 1868). It is very possible it may shortly alter con- 

 siderably ; if it does so, I propose to have it figured in its change 

 of garb*. 



No. 1 (Plate XXIII. fig. 1) may be thus described : — The dorsum, 

 from the head to the tail, is of an olive-brown, deepest in the neighbour- 

 hood of the dorsal fin. On the sides this shades into a yellow, which 

 becomes still lighter below the median hne, and almost white and 

 silvery towards the abdomen. This is particularly the case between 

 the pectoral and ventral fins. The upper part of the head and the 

 snout are of a sombre hue, approaching to that of the back. Scat- 

 tered along both above and below the median line are a series of 

 bright red spots ; these are absent behind the adipose fin. There 

 are ten transverse bars of a purplish grey, deepest in colour below 

 the median line. The two hinder bars are more or less united ; and 

 the same may be said of the anterior one, also indistinctly double and 

 occupying the operculum and suboperculum. The iris is of a golden- 

 yellow colour, the pupil large and black. At the root the dorsal fin 

 is darkest ; but the reverse is the case with the pectoral fins. The 

 ventral fins are the lightest-coloured, the anal and caudal interme- 

 diate in shade. All these fins are of a neutral yellowish brown. 

 The adipose fin is dark brown. 



No. 2 has nearly similar general under- tints to No. 1, but is 

 chiefly distinguished from it by darker markings and spots through- 

 out the body. There are thirteen more or less distinct transverse 

 bars, the opercular one being large and well marked. Between the 

 root of the dorsal fin and the lateral median line a large, broad, and 

 dark-coloured patch exists ; this intermingles to a certain extent 

 with the fifth, sixth, and seventh transverse bars. Both along the 

 deep-brown dorsum and below the median lateral line, upon and 

 between the transverse bars, very many small dark spots are freely 

 dispersed. The lesser-sized red spots in this specimen are irregularly 

 placed both upon and above the lateral line. The dorsal fin has a 

 number of deep-coloured interradial spots, chiefly confined to its root. 



The form of the body in both specimens (the dead and the living 

 one) is that of a Salmonoid, but not the clean plump outhne of a 

 full-grown Salmon. 



* On June 30tli this fish (No. 2) was oarefuUy compared with the drawing 

 made on March 25th ; and the coloration then sensibly ajipeared to have be- 

 come lighter and yellower. The alteration in shade, however (as Tennent, the 

 keeper, justly pointed out), depended more on tlie strong sunlight than on any 

 permanent change ; for in tlie mornings and evenings, or wlien skulking in the 

 shadow of the rockwork, the tone of colour was darker. No silvery-scaled ap- 

 pearance has been assumed this year. 



