. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 402 COMPARATIVE ANATOMY LJ7K—. —£i>rd> •Si-v. FIG. 304. FIG. 305. Fit;. 304 —HEART OF Protoji/tnt* nnnecttns. From the left side, part of the wall of the left atrium being removed. (After Rose.) Co, conus arteriosus; and , left and right atria; , septum atriorum ; Si. ?>, sinus venosus, within which the pulmonary vein (Lv) extends to open into the left auricle by a valvular aperture ; W, fibrous cushion extending into the ventricle. FIG. 305.—Ceratodtisforsteri. DIAGRAMMATIC VIKW OF THE HEART
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 402 COMPARATIVE ANATOMY LJ7K—. —£i>rd> •Si-v. FIG. 304. FIG. 305. Fit;. 304 —HEART OF Protoji/tnt* nnnecttns. From the left side, part of the wall of the left atrium being removed. (After Rose.) Co, conus arteriosus; and , left and right atria; , septum atriorum ; Si. ?>, sinus venosus, within which the pulmonary vein (Lv) extends to open into the left auricle by a valvular aperture ; W, fibrous cushion extending into the ventricle. FIG. 305.—Ceratodtisforsteri. DIAGRAMMATIC VIKW OF THE HEART AND MAIN BLOOD VESSELS AS SEEN FROM THE VENTRAL SURFACE. (From Parker and HaswelFs Zoology, after Baldwin Spencer.) off". 1, 2, 3, 4, afferent branchial arteries ; 1 br, 2 br, 3 br, 4 br, position of gills ; , conus arteriosus ; , dorsal aorta; , ductus Cuvieri ; , , , epiA, efferent branchial arteries ; , hyoidean artery ; , post- caval vein ; , left anterior caroiid artery ; , left auricle , left brachial vein ; , left jugular vein; , left posterior caro- tid artery ; ;, left posterior cardinal vein : , left pulmonary artery; I sc. r, left sub-scapular vein ; car, right anterior carotid artery ; , right auricle ; , right brachial vein ; , right jugular vein ; i:i>;-ar, right posterior carotid ; , right pulmonary artery ; , right subscapular vein ; mi/, ventricle. monary artery like the corresponding vessel in Crossoptfry- gians, arises from the fourth efferent branchial in Ceratodus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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