A cyclopropane ring and a cyclopentane ring share one carbon atom, and a methyl group is on a cyclopropane carbon next to the shared atom. The name is

The smaller ring is cited first, so the descriptor is [2.4]. Numbering starts at a ring atom next to the spiro atom in the smaller ring, so the cyclopropane carbons are C-1 and C-2 and the spiro atom is C-3. A methyl on the cyclopropane carbon adjacent to the spiro atom is C-1.