1958 471 p., numerous figures & plates, paperbound.Includes papers as: Boschma, Review of the scientific activities of Van der Klaauw / Smit, On the fundamentals of Darwin’s theory / Hooijer, The pleistocene vertebrate fauna of Celebes / Slijper, Organ weights and symmetry problems in porpoises and seals / Husson, On the neotropical leaf-nosed bat Sphaeronyvteris toxophyllum / Brongersma, Some features of the respiratory and circulatory systems in the Typhlopidae and some relates snakes / Nieuwkoop et al, The anterior transverse neural fold in Amphibians / Vervoort, The pseudobranchs of Xiphophorus helleri / Fluiter, Notes on birds of the Kwae Noi Valley, Western Siam / Voous, European breeding birds of holarctic distribution / Tinbergen, Bauplan-ethologische Beobachtungen an Möwen / Van Iersel, Some aspects of territorial behaviour of the male three-spined stickleback, etc.