Alkaloidal components of Limacia oblonga (MIERS) Hook. f. et THOMS (Menispermaceae) collected in the Borneo-Sarawak region were examined and three kinds of biscoclaurine-type alkaloids, cuspidaline (I), limacine (II), and limacusine (III) were isolated and identified. These alkaloids are the same as those previously reported in Limacia cuspidata (MIERS) Hook. f. et THOMS, a congeneric plant of the Menispermaceae family.