1903.] ANATOMY OF THE JAPAXESE SALAMAXDER. 299 



great Amphibian which died in the Society's Gardens enables me, 

 however, to add a few new facts to what is already known of its 

 structure. The larger example measures 39 inches, the smaller 

 20 inches. The large Megalohatrachus was injected, and though 

 the injection did not run with equal regularity through all the 

 branches of the arterial system, certain regions were filled with 

 the gelatine, and allow of the description of quite minute arteries, 

 some of which are of importance and apparently have not been 

 described. 



§ On certain of the A hdominal Viscera. 



About one-third of the length of the right lung is free from 

 any mesenteric attachments, and lies freely over the abdominal 

 viscera. The rest of this organ, nearly up to the root, depends by 

 two mesenteries which are inserted along the internal edge of the 

 lung where the pulmonary artery ruias. One of these mesenteries 

 attaches the lung to the liver, the other to the aorta posteriorly, 

 and to the oesophagus anteriorly after the origin of the gastric 

 artery. Anteriorly the two mesenteries arise separately from the 

 lung ; posteriorly they arise in common and ultimately become 

 fused into one membrane, which at the end of the liver is 

 continuous with the mesoarium. 



The tip of the left lung is also free from mesentery, but for a 

 shorter space than that of the right lung. One membrane only is 

 attached to it, which passes to the oesophagvis and stomach 

 anteriorly, and posteriorly joins the mesogastiium. Posteriorly 

 the spleen is suspended in the mesogastrium, and between the 

 spleen and the lung is a funnel-shaped depression of the mesenteiy 

 up which passes the gastro-splenic artery. Posteriorly, the mesen- 

 tery attaching the stomach to the aorta passes into the mesoarium, 

 as has been described on the right side of the body. The liver is 

 furthermore attached to the oesophagus and stomach by a mem- 

 brane which corresponds dorsally to the falciform ligament 

 ventrally. The spleen is borne upon the outside of the hepato- 

 cesophageal mesentery. 



The liver therefore underlies a considerable cavity which is 

 largely separate from the rest of the abdominal cavity, the 

 walls of which are formed by the various mesenteries attached to 

 the liver. Anterioi-ly this cavity extends beyond the liver, and 

 reaches up to the wall of the pericardium ; its boundaries are 

 shown by the dotted line in the accompanying drawing (text- 

 fig. 28, p. 300). Its wall is very strong and tough. Posteriorly 

 the mesenteries supporting the ovaries and the oviducts are not 

 attached separately to the body-wall. The arrangement is as 

 follows : — In the middle line is the mesentery supporting the gut, 

 which is low in the rectal region where the gut is straight, and 

 is higher anteriorly where the gut has a more sinuous course. 

 It ends anterioi'ly upon the ventral surface of the liver on the 

 right side of the gall-bladder, beyond which it does not extend. 

 It is parallel to the falciform ligament, which is attached on the 



