OF THE KOALA and VULPINE JPHALANGER. 567 



The bladder is pyriform and firm, but no nraclms is seen. 

 Lateral peritoneal folds connect it to the pelvic wall, but no 

 other ligaments are present. 



Trichosurus vidjyecida. 



The anterior half of the right kidney is received into a deep 

 recess in the liver, and its postei'ior pole is level with the hilus 

 of the left kidney. The bladder is transversely corrugated on 

 the surface and no urachus is pi-esent. Only one Avide renal 

 papilla is present in each kidney. 



Generative Organs. 



I have nothing to add to existing accounts of the generative 

 oi'gans of either species. 



The Pancreas. 



The duct is dead-white in Phascolarctos and shines through 

 the translucent brown glandular tissue. The latter in my speci- 

 men has the same appearances as those described by Martin (8). 



The Liver. 



Phascolarctos cinereus. 



Forbes (4) described and figured the liver, and Braus (1) 

 described its histology. 



The hepatic artery is very convoluted, and divides into two 

 terminal convoluted branches which diverge at the sides of the 

 gall-bladder. From the left branch a straight, slender cystic 

 artery runs in the free edge of the vesical mesentery to the gall- 

 bladder, which it reaches about its middle ; then it runs poste- 

 riorly along the surface of the gall-bladder as far as the fundus. 



The postcaval vein is never deeply embedded in the hepatic 

 substance, and receives three hepatic veins at its emergence from 

 the anterior surface of the liver. A fourth vein enters it within 

 the organ. 



The common bile-duct does not exhibit cysts of its mucous 

 membrane similar to those of some Marsupials described by 

 Owen (11). 



Trichosurus vulpecula. 



The liver differs from that of Phascolarctos as follows: — 1. It 

 is not so compressed antero-posteriorly. 2. Its edges are not 

 notched by many small fissures. 3. The hepatic tissue is not so 

 subdivided. 4. The right lobe recesses the anterior half of the 

 right kidney. 5. The gall-bladder is shorter and broader, and 

 only projects for a short distance into the abdominal cavity 



