Seven malformed hearts in which a common feature seems to be an exaggerated displacement of the atrioventricular canal towards the bulbus cordis, i.e. the future right ventricle, are described. Transposition or malposition of the great arteries and a ventricular septal defect existed in 6 patients. Certain comparisons are established between previously described entities with which these cases have a clear connexion. The material has been divided into 3 basic groups according to the total or partial grade of the atrioventricular canal displacement towards the bulbus cordis, and to the sequence with which the papillary muscles are missingfrom the rest of the left ventricle. The comparative size of both ventricles is studied in relation to the total area of the atrioventricular canal, which both receive. Attention is called to the frequency with which, in these cases, there was a D-bulbo-ventricular loop and a double outlet right ventricle with a bilateral subpulmonary and subaortic muscular conus. Stress is laid on the importance of the coronary distribution which surrounds the small left ventricle at the time ofdissection and its internal examination. 7he systematic anatomical and clinical study led to an appreciation of the importance of angiocardiography with respect to the diagnosis.

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A case of Uhl's anomaly is described. Nine previously published cases are commented upon and the modes of presentation are discussed.

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