88 ABNORMAL CONDITIONS OF THE HEART AND VESSELS. 



Class V. AEEEST OF DEVELOPMENT*. 



a. Arrested closure of the ductus arteriosus. 



378. The heart of a male Infant, which died with symptoms of 



cyanosis five days after birth. The ductus arteriosus is 

 quite patent. The foramen ovale remains as a slight 

 opening. The heart is abnormally large and weighed 

 1-J- oz. Presented by Dr. Thurnam. 



b. Of the foramen ovale. 



379. The heart of a Child three years old, with a large valvular 



opening in the fossa ovalis. A quill is passed through 

 the opening. Presented by Sir W. Blizard, 1811. 



380. The heart of an Adult with a valvular opening in the fossa 



ovalis. A glass rod has been passed through the open- 

 ing. Presented by Sir W. Blizard } 1811. 



381. A similar preparation. Presented by Sir W. Blizard. 



382. The auricular septum of an adult Human heart, with a 



similar opening in the fossa ovalis. Hunterian. 



383. The auricular septum of an Adult of sixty years of age, 



with a double valvular opening in the fossa ovalis. 



Hunterian. 



c. Of the ventricular septum. 



384. The heart of a lad of thirteen, with both ventricles laid 



open. The septum is deficient above, so that a semilunar 

 opening exists between them. Mus. Heaviside. 



385. An adult Human heart, with a similar semilunar opening 



in the upper part of the ventricular septum, protected by 

 a pouch-like valve of endocardium. The upper edge of 

 this valve is strengthened by a thickened margin, above 

 which there is a semilunar opening between the ventricles. 

 The pouch projects considerably into the right ventricle; 

 it is perforated by several small openings. The outer 

 flap of the tricuspid valve is converted into a similar 

 pouch, which probably covered the septal pouch during 

 the ventricular systole, and partially closed the abnormal 

 opening. Purchased. 



* The other Classes do not occur in this Series. 



