354 MR. F. E. KEBDAliD OX THE [Feb. ijo. 



here a distinct break. Immediately after its origin, tliis artery 

 gives off a branch to the liver. After crossing the portal vein, 

 the artery divides into two branches, one of which runs to the 

 oesophagus and the other pursues its course towards the stomach, 

 and when it reaches that organ again divides into two — an anterior 

 and a posterior branch. The latter is continuous with a trunk 

 running in a sinuous course along the left side of the stomach 

 from end to end, and which is connected (as will be mentioned 

 presently) with other gastric arteries arising from the aorta. 

 From where it crosses the portal vein this artery is accompanied 

 in all its branches by a portal trunk. 



The second gastric artery is purely gastric. It runs straight to 

 the stomach, and thei'e divides into an anterior and a posterior 

 branch. These together form a longitudinal gastric artei'y running 

 along the right side of that organ. This artery is also accom- 

 panied by a poi'tal vein ; and as it arrives at the portal vein a 

 branch from the body- wall enters at a point nearly opposite. This 

 trunk from the dorsal parietes arises from two roots which unite 

 after passing the dorsal aorta. The third gastric arteiy is much 

 farther away. The interspace is occupied by a parietal branch of 

 the portal, which arises by a single root only, and by a gastric 

 branch of the same. This suggests a missing gastric artery, as the 

 correspondence between the gastrics and portals is so great in this 

 species ; but it is to be admitted that there is no further evidence 

 respecting it. 



The third gastric artery is the most important of the series. 

 Unlike the preceding arteries, it supplies both of the longitudinal 

 gastric arteries. It is accompanied by branches of the portal 

 system. The fourth artery is more slender ; it does not seem to 

 be connected with the longitudinal systems arising from the 

 pi-eceding arteries. The fifth artery is not exclusively gastric. It 

 is, in fact, a branch of the superior mesenteric. This branch 

 immediately divides into two trunks, one for each side of the 

 stomach. The first branch, that given off nearest to the aorta, 

 joins the third gastric artery ; the main branch conti-ibutes to 

 the longitudinal trunk of the stomach, which is connected with 

 the first and with the third gastric artery. 



In the second specimen the arteiial system of the stomach only 

 appeared to differ in the absence of the fourth gastric artery, 

 which is slender and unimportant in the first specimen. As in 

 that specimen, the third gastric is by far the most important 

 artery, and it supplies in the same way both sides of the stomach. 



Intestincd Arteries. — Of these, the first and most important is 

 the superior mesenteric. The artery arises from the aorta just 

 opposite to the end of the stomach, as is usual. The next 

 artery, which I call the inferior mesenteric, is very much further 

 back, and arises from the aorta opposite to about the end of the 

 first third of the anterior kidney. It arises dorsal of the 2nd 

 testicular artery. After this I counted foiir rectal arteries in 

 one specimen (the female). 



