PLATE L. 



Fig. 1. Thoracic viscera, ventral view. 

 Fig. 2. Thoracic viscera, ventral view. 



1. Thyroid cartilage. 



2. Muscle of tracheal sac. 



3. M. cricothyroideus. 



4. Phrenic nerve. 



5. Internal jugular vein. 



6. Common carotid artery. 



7. Thyroid gland. 



8. Superior intercostal vein. 



9. Posterior thoracic artery. 

 10. Precava. 



11 Lung. 



12. Thymus. 



13. Pulmonary artery. 



14. Right atrium. 



15. Left atrium. 



16. Right ventricle. 



17. Left ventricle. 



Balamoptera borealis. 







Twice natural size. 



The heart and great veins have been removed. Twice natural s 



18. Pericardial fat pad. 



19. Diaphragm. 



20. Right brachiocephalic artery. 



21. Left common carotid artery. 



22. Left subclavian artery. 



23. Arch of the aorta. 



24. Stump of aorta. 



25. Glandular body, possible parathyroid. 



26. Reflection of serous pericardium. 



27. Upper left pulmonary vein. 



28. Lower left pulmonary vein. 



29. Middle left pulmonary vein. 



30. Right pulmonary artery. 



31. Right pulmonary veins. 



32. Postcava. 



33. Cut edge of fibrous pericardium. 



