The Mammoth cattle! Gen. G.B. McClellan and Garibaldi. : At the Western Exchange Hotel Yard, Fifteenth and Market Street, Philadelphia. The public are invited to call and examine the most extraordinary pair of cattle ever produced in this or any other conntry [sic]. Gen. McClellan took the first prize at four successive state fairs in four states, viz: Indiana, Illinois, Ohio and Kentucky, and is conceded to be the neatest and finest animal every before looked upon. The cattle will remain on exhibition during the present month. They will be slaughtered on or about the 1st of March, and their meat will be sold by A.R. Paul, at his stalls, Second Avenue, Western Market. The butchers selected to dress these cattle, are the following gentlemen: Jos. S. Lowry, Peter Riffert, Samuel S. Coggins, Wm. Myers.