MB. F. DAT ON THE LOCH-LEVEN TKOUT. 
83 
It seemed, so far as we could ascertain, that more animal pond- 
life was present in the lower pond among the greater amount of 
vegetation, especially the sessile-eyed crustaceans Gammarus 
pulex and water-snails (Limn & a ovata , variety peregra). These 
forms were, however, also present in the upper pond, where a 
small water-newt was also netted. During the month of April 
this year, when investigating the stream which issues from the 
lower end of these ponds, I found enormous numbers of tadpoles 
and the larvse of Ephemeridse and their allies. 
A fish captured in the upper pond was seven inches long, its 
colours generally silvery with a golden abdomen, and a few r black 
spots along the sides, three of which were below the lateral line 
and tw r o on it, as well as three red ones ; cheeks silvery yellow, 
abdomen golden. Some spots on the rayed dorsal fin, which 
had a white black-based edge at its upper angle; while the 
ventral and anal fins had a very distinct white black-based 
edging. Upper and lower rays of caudal fin and the upper 
end of the adipose dorsal orange-edged. 52 csecal appendages. 
A male, but sterile. The appearance of this fish as to colour 
was, Mr. Ogden observed, similar to the others removed from 
the pond. 
Two fishes were taken from the lower pond, one ten, the other 
eleven inches long. They were generally purplish, with golden 
reflections. The side of the body (of one which was most criti- 
cally examined) from the upper edge of the pectoral fin to and 
above the lateral line was closely dotted with ocellated black spots, 
while there were also some red ones, five of which w r ere on the 
lateral line. Cheeks golden ; abdomen golden, becoming white 
on the chest. Dorsal fin with numerous spots, and a pink black- 
edged upper angle. Adipose dorsal with a red edge and several 
black spots. Pectoral and ventral chrome with white edges, base 
dark. 62 csecal appendages. A male, with the generative organs 
well developed. 22 small shells of Limncea in its stomach. 
As regards the colour * on the adipose dorsal fin, I examined 
at Howietoun,'on August 15th, 1886, a number of two-year-olds, 
* An interesting occurrence has taken place at Cowley among these fish, 
which would seem to prove that Lochlevens throwing back to brook-trout 
may be consequent upon a diminished supply of food causing deterioration. 
During the last week in November Mr. Ogden was near this lower pond and saw 
a large trout rise ; so he returned to the house, and having obtained his fishing- 
tackle, made a cast over it and captured it at the first throw. The fish proved to 
be 15 oz. in weight and in good condition, but was described to me as having 
