365 



Nachdruck verboten. 

 An Abnormality in tlie Circulation of the Cat. 



By Albert M. Reese. 

 With one Figure. 



Among the abnormalities found by the stujlents in my course in 

 vertebrate zoology, during the past year, was such an unusual con- 

 dition in the abdominal circulation of a cat that it seems worth de- 

 scription. 



The cat, which was dissected by Mr. F. G. Casler, was an ap- 

 parently healthy adult. It had been injected, as was the custom, 

 through the femoral artery, but, when the 

 abdominal cavity was opened, it was found 

 that the post-caval, as well as the arterial 

 system, had been filled with the starch 

 mass. 



The accompanying figure shows three 

 direct connections between the arterial 

 and venous systems, with a possible fourth 

 connection at x. ' 



The dorsal aorta (ao), except for 

 its connections with the post-caval 

 system, was nearly normal, and gave 

 ofi" the usual branches — renals, lumbars, 

 iliacs, etc. 



Abnormal Circulation in the Cat. a connection 

 between the dorsal aorta and the internal iliac vein. 

 ao aorta, b connection between the caudal artery 

 and the external iliac vein, ei external iliac veins. 

 ei' external iliac arteries, i common iliac veins. 

 ii internal iliac veins, ii' internal iliac arteries. 

 im inferior mesenteric artery. I lumbar arteries. 

 Ii iliolumbar vein. W iliolumbar artery, pc post 

 cava. /• renal vein, r' renal artery, t caudal 

 artery, x probable fusion of right external iliac 

 vein and artery. 



The post-cava (pc), on the other hand, divided, just anterior to 

 the origin of the renal veins, and was seen as two distinct vessels 

 from that point to the posterior end of the animal. 



