File:Image from page 554 of "On the anatomy of vertebrates (electronic resource)" (1866) (14752443731).jpg

Identifier: b20416039_001 Title: On the anatomy of vertebrates [electronic resource] Year: 1866 (1860s) Authors: Owen, Richard, 1804-1892 Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds Publisher: London : Longmans, Green Contributing Library: Wellcome Library Digitizing Sponsor: Wellcome Library

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Text Appearing Before Image: Heart of Laci tin occllata. cclxvit. HEART OF REPTILES. 509 335

Text Appearing After Image: Heart of Testudo grccca shape of the body, shows its greatest breadth, figs. 304, A, 335.The two auricles, when distended, are of nearly equal size, andof a subquadrate form, fig. 336, M, O. The bivalved orificebetween the sinus and the auricle, ib.v, o, is a transverse slit. The whitearrow, o, shows the course of the bloodfrom the right auricle, past the valvesupported by the base of the auricu-lar septum, into the aortic cavity ofthe ventricle. In fig. 337 a bristlepasses through the orifice left by theincomplete septum between the aorticand pulmonic cavities into the latter,which is the largest in Emys, as inOphidia and Lacertilia: the bivalvedorifice of the pulmonary artery, p, isshown. In fig. 338 that of the left aorta,A, is similarly exposed, and the in-complete septum is cut through: theroot of the right aorta, a, is behindthat of the left. The relative positionof the origins of the three arteries from the chelonian ventricleis shown in fig. 336, where P is the pulmonary, a th

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