Pp. (6), 347, 25, (v-viii), 293; 100+ text-figures (line-drawings). Original green stiff wrappers, lettered in white on the spine and front cover, 4to. Part I presents the snakes and Part II covers Lizards and Amphisbaenians. This is a revised edition of the original two part set issued in 1970 as United States National Museum Bulletin, no. 297. New material has been added to both parts by P. E. Vanzolini. Detailed keys are provided to all species. No ownership marks and no signs of use.