Today F. Scott Fitzgerald is better known for his novels, but in his own time, his fame rested squarely on his prolific achievement as one of America’s most gifted writers of stories and novellas. Now, a half-century after the author’s death, the premier Fitzgerald scholar and biographer, Matthew J. Bruccoli, has assembled in one volume the full scope of Fitzgerald’s best short fiction: forty-three sparkling masterpieces, ranging from such classic novellas as “The Rich Boy,” “May Day,” and “The Diamond as Big as the Ritz” to his commercial work for theSaturday Evening Postand its sister “slicks.”