1881.] HYBRIDS AMONG THE SALMUNID^. 31 



do°- deformities of the snout being the most perceptible: some were 

 very light-coloured, but not quite albinos, as the markings, although 

 pale, were visible ; and in such as have survived this want of colour 

 still continues. 



In May 1883 I received from Sir J. Maitland one of these fish 

 from the hatching-house : it was 0*8 of an inch long, the anterior 

 portion of its head deformed from want of development of the pre- 

 maxillaries and contiguous bones ; its colour was white without any 

 markings. 



July 20th, 1883, I removed from box 108 some more of these 

 fishes, which were as follows (in inches and tenths) : — 



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



Total length 17 17 17 16 



Length of head 0-1 0"3 0"4 04 



Length of caudal fin ..0-3 025 0"3 0'3 



Height of body 0-3 03 0-3 0-3 



Number of bars 8&9 9&11 9&9 9&10 



November 29th, the following three fishes were removed from the 

 box : — 



Total length 27 2'6 2-2 



Length of head 06 0-6 0-4 



Length of caudal fin.. 0-4 0-5 0'3 



Height of body 05 0-55 0-4 



No. 1 was blind of the left eye, but no perceptible difference 

 could be seen in the colours of the two sides, which were similar to 

 those in No. 2, except having two bands instead of one across the 

 dorsal fin. There were 17 rows of scales between the posterior 

 extremity of the base of the adipose dorsal fin, passing downwards 

 and forwards to the lateral line : in Trout there are normally from 13 

 to 15, and in American Charr from 21 to 26. 



No. 2 had the eyesight apparently normal. The finger-marks 

 along the sides were broken up into arched bands or circles enclosing 

 spaces, the ground-colour being yellowish ; the upper surface of the 

 head and back spotted and marked with black dots ; the rayed 

 dorsal fin with a dark band across its centre and a dark spot at the 

 base of its first ray. There were 22 rows of scales between the 

 adipose dorsal fin and the lateral line. 



No. 3 had the right eye lost, the ball having retracted into the 

 socket ; while the left eye was almost blind, the pupil being reduced 

 to a small slit, while a black-coloured spot was present on the sclerotic. 

 When alive this fish appeared as one of the semi-albinos which I 

 have referred to : the markings were present, but light on both sides, 

 more especially so on the right. There were 15 rows of scales 

 between the adipose dorsal fin and the lateral line. 



On November loth, 1882, 8000 ova were taken from an American 

 Charr, Salmo fontinalis, which were fertilized with milt from a Loch- 

 leven Trout as in the last experiment, the eggs and young being 



