. The elasmobranch fishes . Fig. 158. Ked blood corpuscles of Sqiialns sucMii. (M. C. Williamson, orig.) He.^t The heart in the Elasmobranchs, as was seen in Heptanch us, does not undergo the differentiation characteristic of the more complex heart of higher animals. As a usual thing, it is composed of a thin-walled auricle (atrium) (a«.,fig. 159) and a thick-walled ventricle {vn.). The auricle receives the non-oxygenated blood from the sinus venosus {) and the the ventricle sends it forward through the conus (truncus) arteriosus ().

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