A new kind of abnormal heart in a frog is described. The heart was of the straight form, without sigmoid flexion, having an anterior ventricle. The heart differed from previous cases in lacking a persistent dorsal mesocardium. Absence of a sigmoid flexion is due to abnormal anterfor growth and ventral fusion of the lateral components of the septum transversum. The parts of the heart free to move have undergone various torsions and exhibit internal abnormalities which are described and interpreted. The mode of action of the normal frog's heart is discussed. An abnormality of the left lung of the specimen is described.
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E. W. Baxter (1942) studied this question.
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