74 FIELD MUSEUM OP NATURAL HISTORY ZOOLOGY, VOL. XIV. 



small concealed gall bladder, and in its complete fusion of left lateral and 

 left central lobes. In Dtdelphis, the spighelian lobe is quite small and 

 undivided. In Antechinomys (Beddard, 1908, p. 563) the spighelian is 

 entirely absent and left lateral and left central are completely divided. 

 A spighelian lobe is present in most of the Macropodidae and in one 

 (Dendrolagus) , at least, it is bilobate (Beddard, 1895, p. 134). 



Spleen. The spleen is suspended from the omentum and the dorsal 

 mesentery and lies closely appressed to the dorso-caudad surface of the 

 stomach. It is an elongate organ with a single triangular lobe directed 

 dorsad from the right hand third of the dorsal border. The spleen thus 

 has a general shape resembling a figure four or a bisected head of a blunt- 

 pointed arrow (PL VII, Fig. i). 



Pancreas. The pancreas is an extensive, much divided gland lying 

 ventrad of the spleen and suspended between it and the intestines over 

 the surface of which some of its smaller digitations run. In common 

 with the spleen it has some attachment to the omentum and dorsally 

 it is connected with the main dorsal mesentery. One long branch of it 

 lies between the principal longitudinal folds of the duodenum. The 

 main pancreatic duct, joined with the common bile duct, enters the 

 duodenum some 10 mm. below the pylorus (PL VII, Fig. 2). The two 

 ducts meet nearly at right angles a very short distance from or practically 

 at the surface of the duodenum. Thence through the membranes of the 

 duodenum there is an appreciable common duct carrying both biliary 

 and pancreatic products to the common opening on the inner surface of 

 the duodenum. At a point nearly opposite the union of the main ducts, 

 the pancreatic duct receives an important branch or accessory duct 

 derived from that lobe of the pancreas which lies along the duodenal 

 fold. 



Salivary glands. The parotid gland (PL IV, Fig. 2) is extensive 

 and invests the base of the external ear except in its dorsal third. It 

 covers a part of the trapezius muscle, the sternomastoid and all the 

 superficial muscles of the side of the neck. Three lobules are distinguish- 

 able, one anterior and two posterior, the dorsal of these latter being the 

 larger. In a male specimen, the length of the gland is 16 mm. and its 

 greatest dorso-ventral depth 10 mm. Its duct leads forward crossing the 

 masseter superficially and then, sinking slightly, opens into the mouth 

 near the first upper molar tooth. 



The submaxillary gland also is large and is intimately associated 

 with the parotid. It lies in ventro-lateral position relative to the parotid 

 and has a detached lobe lying between its principal longitudinal lobe 

 and the parotid. Its duct was not traced with certainty. 



A large sublingual gland lies along the inside of the mandibular 



