. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. The Anatomy of Chlamydoselachus 459 loosely laid one upon another, those in the posterior section, or stem of the pipe, running transversely, and those of the anterior section being longitudinal. Behind the ventricle, in the partition, between the peritoneum and the pericardium, there is a spongy mass of dark tissue an eighth of an inch in thickness. Giinther (1887) had available for examination three well-preserved specimens of Chlamydoselachus. His drawings, illustrating the external form of the heart and the configuratio
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. The Anatomy of Chlamydoselachus 459 loosely laid one upon another, those in the posterior section, or stem of the pipe, running transversely, and those of the anterior section being longitudinal. Behind the ventricle, in the partition, between the peritoneum and the pericardium, there is a spongy mass of dark tissue an eighth of an inch in thickness. Giinther (1887) had available for examination three well-preserved specimens of Chlamydoselachus. His drawings, illustrating the external form of the heart and the configuration of the valves of the conus, are reproduced as my Text-figures 102a and 102b. Giinther gives no general description of the heart, but it will be noticed that his figure confirms Carman's () statement con- cerning its form. Ayers' (1889) Fig. 2 (reproduced as my Text-figure 105, p. 462) portrays the heart of Chlamydoselachus in sectional view, and the drawing appears to be semi-diagrammatic. Therefore this figure does not give us much /'^ information concerning the form of the heart in his specimen. His description (p. 194) of the conus arteriosus follows: •^' %. 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' s
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