A new kind of Abnormal Heart in the Frog



  • 1A new kind of abnormal heart in a frog is described.
  • 2The heart was of the straight form, without sigmoid flexion, having an anterior ventricle.
  • 3The heart differed from previous cases in lacking a persistent dorsal mesocardium.
  • 4Absence of a sigmoid flexion is due to abnormal anterfor growth and ventral fusion of the lateral components of the septum transversum.
  • 5The parts of the heart free to move have undergone various torsions and exhibit internal abnormalities which are described and interpreted.
  • 6The mode of action of the normal frog's heart is discussed.
  • 7An abnormality of the left lung of the specimen is described.