The new diterpene acids, eperu-8(20)-en-15,18-dioic acid (IIIa), 15-hydroxy-eperu-8(20)-en-18-oic acid (IIId) and the Δ⁴-butenolide (Va) have been isolated from Ricinocarpus muricatus, which has also yielded the new flavone pigments 5,3',4'-trihydroxy-3,7,8-trimethoxyflavone (IXc) and 5,7,3',4'-tetrahydroxy-3,8-dimethoxyflavone (IXd). In PART XII we described the structural chemistry of eperuane-8β,15,18-triol (Ia), eperuane-8β,15,18-triol (Ib) and 15,16-dihydroxy-eperu-8(20)-en-18-oic acid (II) which were isolated from Ricinocarpus suaveolens Muell. Arg. and we now wish to discuss some other compounds isolated from this source.