SCIENTISTS HAVE discovered the remains of a horned dinosaur and an armored dinosaur at two widely separated locations in Alaska, a researcher reported Wednesday. . . . IN AN ATTEMPT to win back voters, the leaders of Italy's Communist Party have decided to abandon communism - in name and philosophy - and become a more mainstream leftist party. . . .THE CALIFORNIA Supreme Court has refused to consider a bid by financier Charles H. Keating Jr. to get his $5 million bail lowered.