London, Printed for the Palæontographical Society, 1850-72. 4to. Bound in 2 later solid full cloth, title-and tomelabels gilt in leather on backs. LXXXV,322;III,66,26,46,24,73,12 pp. and 121 fine lithographed plates (each with many figs. and each with an unpaginated description-leaf). Only very few brownspots.
First edition of these 2 works, in reality separate with their own titles, but Duncans work considered as a succession of the first. - Nissen ZBI: 2841 for the first work, Duncan's not in Nissen.