. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. 458 Bashford Dean tAemorial Volume Departing considerably from the conventional form of heart, this genus presents a shape that is somewhat pecuHar. Seen from below, it has a small subquadrangular ventricle, a large auricle, and a long bulbus arteriosus. The ventricle measures nearly three-quarters of an inch in either width or length. When fiUed, the auricle is subtriangular, and measures on each side an inch and a half. The bulbus is almost twice as long as the ventricle. Behind the auricle,and above and behind the ventri
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. 458 Bashford Dean tAemorial Volume Departing considerably from the conventional form of heart, this genus presents a shape that is somewhat pecuHar. Seen from below, it has a small subquadrangular ventricle, a large auricle, and a long bulbus arteriosus. The ventricle measures nearly three-quarters of an inch in either width or length. When fiUed, the auricle is subtriangular, and measures on each side an inch and a half. The bulbus is almost twice as long as the ventricle. Behind the auricle,and above and behind the ventricle, hes the sinus, w^hich has a capacity that nearly. Text-figure 101. Heart of Chlamydoselachus: A, in ventral view; B, longitudinal section showing cavity in ventricle, also valves of the bulbus (conus) arteriosus. 1, auricle (atrium); 2, ventricle; 3, bulbus (conus) arteriosus; 4, sinus venosus; J, dark tissue between cardiac and abdominal chambers; 6, cavity in ventricle; 7, valves in bulbus (conus). Printed from original wood-cuts after drawings by Paulus Roetter for Garman, , Pis. XVII and XVUI. equals the bulk of the ventricle. From it the opening into the auricle is guarded by a pair of \'alves that are without chordae. The auriculo-ventricular opening is furnished w^ith a pair of valves provided with chordae tendineae. In the ventricle the cavity or chamber is small; its outhnes in longitudinal section resemble those of a pipe with a short stem, the stem being directed toward the left upper side and the bowl toward the bulbus. Along the inside of the passage (Fig. B, pi. XVIII) [my Text-figure 101b], the muscles he in bands (columnae). 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 Dean, Bashford, 1867-1928; Gudger, E. W. (Eugene Willis), 1866-1956. New York : [American Museum of Natural His
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