322 Mr. Guthrie on the Structure of the 



formed a cavity three times as large as the stomach, and parallel 

 contractions on the surface gave it the appearance of being divided 

 into three equal lobes; the animal was a female and weighed about 

 460 pounds. 



^To be continued. J 



Art. XLI. Observations on the structure of the Heart of 

 the Testudo Jndica, founded on the examination of a Spe- 

 cimen in the Collection of the Zoological Society. By G. J. 

 GuthriKj Esq^ F.R.S., Professor of Anatomy and Sur- 

 gery, Royal College of Surgeons, b)C. 



The heart is composed of two auricles and two ventricles, the latter 

 communicating with each other. The right auricle, which is by much 

 the largest, receives the blood returning from every part of the body, by 

 a large vein or sinus, which enters at the upper and back part, and has 

 two valves, the inner the largest, which, when the auricle is full, prevent 

 the further ingress of blood, the edges of the valves meeting so as t 

 form a mere slit between them. This sinus is so continued into the' 

 walls of the auricle, as to appear, when distended, an addition to it, and 

 is evidently intended as another receptacle, in which the venous blood 

 may be detained without inconvenience. 



The blood from the lungs is returned into the left auricle by one pul- 

 monary vein, which enters at the upper and inner part of the auricle, 

 having received a second pulmonary vein nearly at the point of entrance, 

 and is furnished with a valve formed by a fold of the septum. This auri- 

 cle is of a more regular, and of a rounder form than the other, and was in 

 this instance full of coagulated blood. The auricles are divided by a thin 

 and membranous, but complete septum. The walls are strong and mus- 

 cular, those of the right being about as thick again as those of the left. 

 Neither of them have aii appendix, but the round point or termination 



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