Abstract
Gross morphology and histology of the heart in Siren lacertina are examined. This work is the first histological study of the heart in this species and for that matter in the Sirenoidea. The gross study is the only complete, modern work on the heart. The heart of Siren is composed of the partially septate sinus venosus, two atria, partially septate ventricle and conus arteriosus. The truncus arteriosus is transitional between cardiac and vascular systems. Many characteristics in the heart are studied, including the relation of chambers one to the other, connective tissue ligaments stabilizing the heart within the pericardial cavity and organization of cardiac muscular trabeculae and connective tissue bands. Additional structures examined
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