402 UNUSUAL ARRANGEMENT [October, 



ical Museum, lately given by his widow to the university 

 of Pennsylvania. 



The peculiarities of the preparation are the following: 

 The ascending vena cava, instead of receiving the hepa- 

 tic veins and afterwards entering into the inferior part of 

 die right auricle of the heart, takes its course on the right 

 side of the spine, mounts up high into the thorax, forms 

 an arch over the root of the right lung, and joins the trunk 

 formed by the right and left subclavian and jugular veins. 

 The trunk formed by these several unions, then enters 

 the right auricle of the heart at the usual place of the de- 

 scending cava. See Fig. 1, Nos. 3, 4, 5, 6. 



This an^angement gives the preparation a very curi- 

 ous appearance when viewed anteriorly, see Fig. 2, Nos. 

 3, 4; for instead of the single arch formed by the aorta as 

 usual, we find a double arch; one, the trunk of the arterial 

 system and carrying the blood from the heart, the other 

 the common trunk of the venous system and bringing the 

 blood to the heart. 



There is no vena azygos for receiving all the inter- 

 costal veins of the right side and a part of those of the 

 left, the oilice of this vein being supplied by the ascend- 

 ing cava, as seen in Fig. 1, No. 11. The hepatic veins 

 empty into the inferior part of the right auricle, at the 

 usual place of the ascending vena cava. The right he- 

 patic vein passes in singly, the middle and left form a 

 trunk. See Fig. 1, No. 8, and Fig. 2. No. 11. 



The internal jugular veins have the usual course, the 

 external deviate very much from it. The latter unite 

 about the superior part of the sternum, making a fork, 

 and into the middle of the fork passes the inferior thyroid 

 vein, see Fig. 2, Nos. 8, 9. A common trunk is then 



