Houston-based Landry's has reached a deal to buy 21 Mitchell's Fish Market, Mitchell's Steakhouse and Cameron's Steakhouse restaurants from Ruth's Hospitality Group for $10 million. The restaurants will add to Landry's collection of more than 500 dining establishments, which operate under the Landry's Seafood, Rainforest Cafe, Morton's The Steakhouse, McCormick & Schmick's Seafood, Chart House, Saltgrass Steak House, and other names.