BULLETIN OF THE UNITED STATES FISH COMMISSION. 31 
They also attain an extraordinary size, the largest specimen on record 
weighing nearly 18 pounds ; but the average size of fish ordinarily 
taken with a fly is from 1 to pounds. 
The Loch Leven trout (Salmo levenensis ) is closely allied to and by 
some has been claimed to be identical with the European or brown 
trout (Salmo fario ), but this view is not shared by Dr. Francis Day and 
Sir Gibson Maitland, who classify the Salmonidce as follows : 
Sub-genus A. 
Deciduous vomerine teeth — Salmones. 
a. About eleven rows of scales in an oblique line from adipose dorsal fin to tho 
lateral line. 
1. Salmo salar The salmon. 
b. Fourteen or more rows of scales in an oblique line from adipose dorsal fin to 
the lateral line. 
2. Salmo trutta - The sea trout. 
VARIETIES. 
(a) Salmo albus, under which Day includes S. eriox or S. brachypoma ; in 
other words, bull trout. 
(b) Salmo cambricus, commonly called the sewen. 
2 A. Salmo levenensis The Loch Leven trout. 
2B. Salmo fario The common trout. 
VARIETIES. 
(a) Salmo orcadensis 
(b) Salmo ferox 
(c) Salmo cornubiensis 
(d) Salmo nigripinnis — . 
(e) Salmo estuarius 
(/) Salmo stomuchicus 
(g) Swaledale trout. 
(li) Ciassapuill trout. 
Sub-genus B. 
Vomerine teeth restricted to near the head of that bone — Salvelini. 
3. Salmo alpinus . . .t The alpine char. 
. The Loch Stennis trout. 
The ferox. 
, The Cornwall trout. 
The black-finned trout. 
The Galway sea trout. 
The gillaroo. 
VARIETIES. 
(a) Salmo perisii The Welsh char. 
(b) Salmo willughbii The Windermere char. 
(c) Salmo Icillinensis The Loch Killin char. 
(d) Salmo grayii ....The Lough Melvin char. 
(e) Salmo colii The Lough Eske char. 
4. Salmo fontinalis The American char. 
All British char are varieties of 3, S. alpinus. The American brook trout ranks as 
S. fontinalis. 
The following facts are furnished by Sir Gibson Maitland : 
“ Loch Leven is a lake of between three and four thousand acres, fully 
one-half of which averages a depth of 12 feet. The lower end and cen- 
