The connecting systems of the reptile heart

THE SINO-VENTRICULAR CONNECTIONA sino-ventricular bundle, or dorsal ligament, has already been described by me in the hearts of Lacerta agilis, and J,.viridis, of Clemmys lutaria and Chelopus insculptus.By observing this ligament in living hearts under the binocular microscope, and from the study of transverse, frontal and sagittal sections, it was seen to be a band of connective tissue, containing nerves and blood vessels, running between the sinus and tliL ventricle well over to the right side of the heart, (Laurens '13 a and '13 b).I n my first paper it was further shown that this ligament had no significance for the coordination of the heart beat.This band of tissue had previously been described and experimented with by several investigators, and a discussion of their various views as to its structure and physiological importance will be found in my papers and in a recent publication by Mangold ('14).Mackensie ('13) has recently described in the heart of the salempenter, a South Xmerican lizard, a '' sinu-auricular bundle"