1953 550 p., 364 text figures. Publisher's green embossed cloth with gilt title on spine. A clean, "as new" copy, except for some paper (and some slight text loss) to the lower corner of the page 235-236 leaf. This is provided in photocopy.Major taxonomic study. Excellent for identifications. The family Helicophidae is introduced here as new, as are new genera in other families, as well as many new species. A clean, "as new" copy, except for some paper (and text loss) to the lower corner of the page 235-236 leaf. This is provided in photocopy.