452 



ANATOMY OF VERTEBRATES. 



368 



markable stomach. In the Koala the under-surface of the 

 liver, fig. 368, is subdivided into thirty or forty lobules : this 

 condition is presented in a minor degree in the Ursine Dasyure. 

 In a long-tailed Dasyure, which weighed 3 lbs. 8£ oz., the liver 

 weighed 3J oz. avoirdupois. The suspensory fold in Lyencephala 

 shows hardly a trace of *■ ligamentum rotundum.' 



The gall-bladder is present in all Marsupials, is of large size, 

 and loosely lodged in a deep cleft of the cystic lobe. In the 

 Opossum it generally perforates that lobe, and the fundus appears 

 at a round opening on the convex surface of the liver. I have ob- 

 served a csecal process from 

 the cystic duct, like the 

 beginning of a second gall- 

 bladder. 1 The coats of the 

 ductus choledochus are 

 thickened toward its termi- 

 nation, and become the seat 

 of numerous mucous cysts 

 which open into the interior 

 of the duct. In the Phalan- 

 gers the terminal half-inch 

 of the ductus choledochus 

 is similarly enlarged and 

 glandular. The biliary and 

 pancreatic ducts generally 

 unite together before per- 

 forating the duodenum : in 

 the Virginian Opossum, the 

 long-nosed Bandicoot, and 

 the long-tailed Dasyure, 

 they pour their secretions 

 into the gut an inch from 

 the pylorus : in the great 

 Kangaroo the glandular 

 ductus choledochus is joined 

 by the pancreatic duct, and 

 terminates in the duodenum 

 5 inches from the pylorus. 

 The answerable parts of 

 the liver under its various degrees of division are indicated by the 

 suspensory fold or ligament, which enters a fissure called < suspen- 

 sory/ and by the gall-bladder, which occupies a depression, fissure 



1 cxlvii". p. 247. 



Liver and gall-bladder, Koala. 



