PLATE XI. 



Heart and Arteries of Penguins. 



Fig. 1. — Exterior of heart of Eudijptes chrysocome ; natural size. 



C. A. Carotid artery. 



/. A. luuominate artery. 



./. V. Jugular vein. 



S. A. Subclavian artery. 



S. V. Subclavian vein. 



T. G. ThjToid gland. 



V. C. I. Inferior vena cava. 



V. C. S. Anterior venje cavae, right and left. 



Fig. 2. — Heart of Aptenodytes longirostris, opened to show the interior of the right 

 auricle and ventricle ; natural size. 



A. Aorta. 



F. C. S. Superior vena cava. 



V. C I. Inferior vena cava. 



Fig. 3. — Heart of Aptenodytes longirostris, opened to show the interior of the left auiiclc 

 and ventricle ; natural size. 



A. Aorta. 



F. C. S. Superior vena cava. 



Fig. 4. — Palmar surface of wing of Ajytenodytes longirostris ; one-half natural size. 



A. B. Brachial artery. 



A. R. Radial artery. 



A. T. Thoracic artery. 



A. U. Ulnar artery. 



B. I. Brachialis internus muscle. 

 Inf. Sp. Infra-spinatus muscle. 



P. Maj. Pectoralis major muscle. 



.P. Min. Pectoralis minor muscle. 



R. M. Eete mirabile. 



F B. Brachial vein. 



Fig. 5. — Dorsal surface of wing of Aptenodytes longirostris ; one-half natural size. 



A. P. Profunda artery. 



A. R. Termination of radial artery. 



A. U. Termination of ulnar artery. 



P. Maj. Pectoralis major muscle. 



TR. Triceps muscle. 



