Preface - Note on Nomenclature - General Nature and Significance of the Fetal Membranes - Anamniota (Ichthyopsida) - Amniota, except Eutheria - Eutheria or Anostroca - Analyses, Deductions, Applications and Comments - Data on the Fetal Membranes of Specific Eutherian Taxa - Glossary - Bibliography - Index
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Hradecký et al. (1987) studied this question.