. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Si^, Fig. -nm. + ' ^ ^ \'L — < Fig. 248. Fig. 247.—Heart of Proiopterus annectens. From the left side, part of the wall of the left atrium being removed. (After Rose.) W, fibrous cushion extending into the ventricle ; Si. r, sinus venosus, within which the pulmonary vein (Lv) extends to open into the left auricle by a valvular aperture; L. Vh and E. Vh, left and right atria; , septum atriorum ; Co, conus arteriosus. Fig. 248.—Ceratodns forsieri.
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Si^, Fig. -nm. + ' ^ ^ \'L — < Fig. 248. Fig. 247.—Heart of Proiopterus annectens. From the left side, part of the wall of the left atrium being removed. (After Rose.) W, fibrous cushion extending into the ventricle ; Si. r, sinus venosus, within which the pulmonary vein (Lv) extends to open into the left auricle by a valvular aperture; L. Vh and E. Vh, left and right atria; , septum atriorum ; Co, conus arteriosus. Fig. 248.—Ceratodns forsieri. Diagrammatic A''iew of the Heart .and JIain Blood Vessels as seen from the Ventral (From Parker and Haswell's Zoology, after Baldwin Spencer.) 1, 2, .3, 4, afferent branchial arteries ; \hr, 2 br, 3 hr, 4 br, position of gills ; , conus arteriosus; , dorsal aorta; , ductus Cuvieri; , , , I'piA, efferent branchial arteries ; , hyoidean artery ; i. r. c, post- caval vein ; , left anterior carotid artery; Lam; left auricle; , left brachial vein; /.jin/.r, left jugular vein ; , left posterior caro- tid artery; /.^os^.ca^T^, left posteriorcardinal vein ; , \eit pulmonary artery; , left sub-scapular vein ; r. aw/, rar, right anterior carotid artery ; , right auricle ; , right brachial vein ; »</.«, right jugular vein; , right posterior carotid ; , right pulmonary artery ; , right sub-scapular vein ; rent, ventricle. «/• begins to be divided into two chambers. In Protopterus this divi- sion is complete, so that two currents of blood, mainly arterial and. 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, William Newton, 1857-1923. London, Macmill
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