Arietites (Arietites) bucklandi (Sowerby 1816)

30cm. in circumference. Out of the Arieten layers of the Sinemurian (Lias alpha). Found a piece of it at a dump on the Swabian Alb near Rottweil, went back a week later looking for the other half and had the good luck to find it. They fit together like a glove.