interior surface of the stomach (see ALIMENTARY CANAL: _Stomach Chamber_), while a convexity, known as the _tuber omentale_, fits into the lesser curvature of that organ. The posterior boundary of the quadrate lobe is the _transverse fissure_, which is little more than an inch long and more than half an inch wide. This fissure represents the hilum of the liver, and contains the right and left hepatic ducts and the right and left branches of the hepatic artery and portal vein, together with nerves and lymphatics, the whole being enclosed in some condensed subperitoneal tissue known as _Glisson's capsule_. Behind the transverse fissure the lower end of the Spigelian lobe is seen as a knob called the _tuber papillare_, and from the right of this a narrow bridge runs forward and to the right to join the Spigelian lobe to the right lobe and to shut off the transverse fissure from that for the vena cava. This is the _caudate lobe_. The right surface of the liver is covered with peritoneum and is in contact with the diaphragm, outside which are the pleura and lower ribs. From its lower margin the _right lateral ligament_ is reflected on to the diaphragm. A similar fold passes from the tip of the left lobe as the _left lateral ligament_, and both these are the lateral margins of the coronary ligament. Sometimes, especially in women, a tongue-shaped projection downward of the right lobe is found, known as _Riedel's lobe_; it is of clinical interest as it may be mistaken for a tumour or floating kidney (see C. H. Leaf, _Proc. Anat. Soc_., February 1899; _Journ. Anat. and Phys_. vol. 33, p. ix.). The right and left _hepatic ducts_, while still in the transverse fissure, unite into a single duct which joins the cystic duct from the gall bladder at an acute angle. When these have united the duct is known as the _common bile duct_, and runs down to the second part of the duodenum (see ALIMENTARY CANAL). [Illustration: From A. Birmingham Cunningham's _Text-book of Anatomy_. FIG. 1.--The Liver from below and behind, showing the whole of the visceral surface and the posterior area of the parietal surface. The portal fissure has been slightly opened up to show the vessels passing through it; the other fissures are represented in their natural condition--closed. In this liver, which was hardened _in situ_, the impressions of the sacculations of the colon are distinctly visible at the colic impression. The round ligament and the remains of the ductus venosus are hidden in the depths of their fissures.] [Illustration: FIG. 2.--Transverse section through the hepatic lobules. i, i, i, Interlobular veins ending in the intralobular capillaries. c, c, Central veins joined by the intralobular capillaries. At a, a the capillaries of one lobule communicate with those adjacent to it.]