Besides one aporphine, two benzylisoquinolines, and four bisbenzylisoquinolines previously known, Gyroratpus amicanuJ has furnished five new dimeric alkaloids: 0-methyl limacusine (l), gyrocarpusine (3), gyroamericine (5), gyrolidine (7), and gyrocarpine (8). The interesting feature is the presence of 6'-hydroxy or 6-hydroxybisbenzyltetrahydroisoquinoline alkaloids. Structures were ascertained by 360 MHz 'H nmr.