From the fleet off Key West.
New Orleans, April 22.
--The Mohawk, from Havana and Key West, reports that the steamer Atlantic, from New York, with troops, had anchored off the Triangle Shoals, and on the 13th was in communication with Fort Taylor.
She left on the 14th, for Sand Key. The steamer Powhatan appeared off the harbor on the 14th, and exchanged signals with the steamer Crusader.
The garrison at Fort Taylor and Key West Barracks are engaged in drilling at the guns.
The commanding officer of Fort Taylor has been appointed postmaster at Key West.