APPENDIX TO THE REPORT ON FISHES. 
BY GEO. SUCKLEY, M.D. 
The determination of species and their specific characters have in Chap. 2, been almost entirely 
copied from Dr. Girard's General Report on Fishes, vol. x. P. R. R. Reports. 
In some of the families we are aware, that several practical naturalists of California and elsewhere 
hold different views from those expressed by Dr. Girard. This is especially the case concerning the 
genera and species of the Scorp^nid^ and Embiotocoid^. 
As a thorough review of all the works and opinions on the subject could not be entered into 
during the past year, we have preferred temporarily retaining Dr. Girard's nomenclature, rather than 
attempting partial alterations which themselves would be faulty. 
Chapter I, that upon the Salmonidaj, has been written after much study and original inves- 
tigation. In it we have but occasionally followed the determinations of species contained in the 
report mentioned. 
Since the manuscript of the present work was turned over to the Congressional Printer in 
February, 1859, we have again crossed the continent, via the Platte River, Bridger's Pass, Salt Lake, 
Carson Valley, and the Sierra Nevadas to San Francisco. Thence by sea to Vancouver's Island. 
In the course of this journey, many notes were made, concerning objects of interest in nature, 
most of which, however, are from force of circumstances necessarily excluded from these pages. 
Nevertheless, we are hapjDy to add a few brief items of information concerning the Salmonidge. 
None of this family were found along our route on the eastern slopes of the Rocky Mountains ; but, 
in most of the streams of Utah, more especially Black's Fork near Fort Bridger, Weber River, and 
the Timpanogos (flowing into Lake Utah through Provo Canon) the Salmo virginalis — a very hand- 
some trout — was plentiful. In its habits and general appearance it much resembles the brook-trout 
of the middle States {S. fontinaUs). It is abundant in Black's Fork, from which on the 25th of Au- 
gust, we caught half a dozen, and on the following day about forty, with the artificial fly, to which 
they rose exactly in the manner of their more eastern relatives, and greedily seized like unsophis- 
ticated fish as they were — scarcely learning caution or timidity until pricked once or twice by the 
alluring and deceitful bait. Probably but few artificial flies — if any — had ever before been cast on 
those waters. One specimen about ten inches in length, caught with a red-hacHe, was selected for 
examination and description. In general outline it was perhaps slightly more stout than the brook- 
trout of New York {S. foniinalis). The curve from the nose to the anterior insertion of the dorsal 
