In my article in the previous issue of this Journal (JHS lxxviii (1958) 12) one of the points I tried to make was that the two-level ship was not, as is usually thought, a transient phase between the single-level ship and the trireme, but that representations of it appeared not long before 700 B.C. and continued until after the trireme is thought to have been introduced into Greece, i.e. during the third quarter of the sixth century.