. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. The conus arteriosus forms a thick spindle-shaped trunk about an inch long and one-fourth of an inch in diameter. It is pro- vided with six rows of valves, all of which are quite small, except the anterior set of three, which are large, tridentate, and formed of a white tough tissue of a cartilag- inous consistency. Text-figure 102. Heart of Chlamydoselachus: A, in ventral view; B, conus arteriosus opened longitudinally to show the arrangement of the valves. r, right atrium; !, left atrium. After Gunther, 1887, Figs. 7 and
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. The conus arteriosus forms a thick spindle-shaped trunk about an inch long and one-fourth of an inch in diameter. It is pro- vided with six rows of valves, all of which are quite small, except the anterior set of three, which are large, tridentate, and formed of a white tough tissue of a cartilag- inous consistency. Text-figure 102. Heart of Chlamydoselachus: A, in ventral view; B, conus arteriosus opened longitudinally to show the arrangement of the valves. r, right atrium; !, left atrium. After Gunther, 1887, Figs. 7 and 8, pi. LXV. My observations do not entirely agree with those of Garman and Gunther regarding the proportions of certain parts of the heart. In my three specimens (from the fourth specimen the heart had been removed) the conus arteriosus is indeed long, as in Garman's, Giinther's, and Ayers' specimens; but the ventricle, even when empty, is larger than it appears in the figures by Garman and Giinther, and the si2,e of the atrium is variable. Text-figure 103a is drawn from my specimen No. Ill in which the ventricle (v.) is moder- ately distended with blood. The atrium (atr.) is empty, but in its flattened condition it retains a smoothly rounded outline, as shown in the figure. The size of the atrium is somewhat exaggerated due to its flattened condition; nevertheless, the atrium of this Text-figure 103. Hearts of two specimens of Chlamydosel- achus, in ventral view, one-half natural size: A, drawn from No. Ill; B, from No. II. atr., atrium; ecu., common cardinal vein; co., conus arteriosus; , sinus venosus; v., ventricle. Drawn from specimens in the American 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 Mus
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