PLATE VIII 



Plate VIII is from the upper surface of a section 

 through the upper third of the body of the fifth thoracic 

 vertebra posteriorly, and the lower part of the second in- 

 tercostal space anteriorly. The plane of the section is 3.8 

 cm. below that of the preceding section. The anterior 

 margin is 2.2 cm. lower than the posterior. 



The posterior semilunar valve of the pulmonary 

 orifice is left in this section, the right and left anterior 

 semilunar valves were removed with the section above. 

 The pulmonary artery lies almost entirely in the section 

 above this. 



The pericardial cavity, though wide in this section, is 

 very shallow, being filled by the widening out of the right 

 auricle and ventricle at a slightly lower level, and the ap- 

 pearance of the left auricular appendix in the left posterior 

 part of the cavity. 



The vena cava superior enters the right auricle (Atrium 

 dextrum) about .5 cm. below the surface of the section. The 

 section is through the apex of the right auricular appendix. 



SS 



