NOTICES OF NEW BOOKS. 225 
criticism of the results of the deep-sea dredging on board H.M.S. 
‘Challenger.’ 
The second half of Dr. Giinther’s work embodies what he 
terms “the Systematic and Descriptive Part,’ and comprises a 
general classification, with diagnoses of the orders, families, and 
principal genera; a brief indication of the number and geogra- 
phical distribution of the species, with general remarks on 
peculiarities of form and habit, mode of capture, use and value 
in commerce, and so forth. 
The numerous illustrations with which the text is interspersed, 
viewed in connection with the descriptions given, greatly facilitate 
the identification of the principal genera. 
No group of fishes presents more difficulties to the ichthy- 
ologist, with regard to the distinction of the species and to certain 
points in their life-history, than the Salmonide, and an authori- 
tative review of this family was much needed. We are glad to 
find that this is now supplied by Dr. Giinther in the work before 
us (pp. 631—651), and clears up much of the confusion and mis- 
conception which has long existed concerning the Salmonide. 
It is remarkable that no less than fifteen well-marked species 
of this family should be peculiar to the British Islands; yet such 
appears to be the case. ‘The species in question are— 
1. The Short-headed Salmon, Salmo brachypoma. Found in 
the Firth of Forth, the Tweed, and the Ouse. 
2. The Galway Sea Trout, S. gallivensis. Galway and the 
West of Ireland. 
%. The Loch Stennis Trout, S. orcadensis. Lakes of Orkney. 
4. The Great Lake Trout, S.feroz. Larger lakes of Scot- 
land, the North of England, and Wales. 
5. The Gillaroo Trout, S. stomachicus. Lakes of Ireland. 
6. The Black-finned Trout, S. nigripennis. Mountain lochs of 
Wales and Scotland. 
7. The Loch Leven Trout, S. levenensis. Loch Leven, Loch 
Lomond, and Windermere. 
8. The Welsh Char, S. perisii. Llanberis Lake, North Wales. 
9. The Windermere Char, S. Willughbu. Windermere and 
other lakes in the North of England, and Loch Brinach, 
Scotland. 
10. The Loch Killin Char, S. killinensis. Loch Killen, 
Inverness. 
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