1896.] ANATOMY or PBTBOGALB XANTHOPUS. 713' 



marked on the posterior part of the dorsum. Foliate papillae are 

 present in their normal position but are feebly marked. There 

 are three circumvallate papilla;, the central one being well marked, 

 while the lateral ones are indistinct and situated just in front of 

 the papillae foliatae. The Tonsils answer to Owen's description ' ; 

 each consists of eight or ten nodules of lymphatic tissue about the 

 size of a pin's head lying in a well-marked fossa just beneath the 

 soft palate. The Parotid Oland, as is usual in the Macropodidse, is 

 very large and reaches from the root of the ear along the side of 

 the neck, dorsal to the external jugular vein, almost to the scapula. 

 The Suhmaxillary Gland is small and oval, and is situated on the 

 ventral side of the external jugular vein just clear of the angle of 

 the jaw. 



The Sublingual Gland is very small. 



The (Esophoffus is long and narrow and has a considerable course 

 in the abdomen. 



The Stomach of Pelrogale penicillata has been carefully examined 

 by Beddard and contrasted with that of Dendrolagus bennettii'. 

 The stomach of Petrogale xanihopus agrees with his description 

 and I shall content myself with mentioning that it measured 

 24 inches along the greater curvature and 13 along the lesser. 



The Spleen differs from that of Dendrolagus and resembles the 

 normal marsupial arrangement in being distinctly A-shaped ; the 

 stalk and posterior limb of the A together measure 5| inches, the 

 anterior limb 2 inches. The stalk and posterior limb evidently 

 correspond to the spleen of other mammals, because the gastro- 

 splenic omentum is attached along them. Apart from the place 

 where the extra limb comes off there are no notches in the 

 spleen. 



The Liver of PetrogaJe penicillata has been figured by Beddard : 

 the arrangement of its lobes agrees very accurately with that of 

 P. xanthopus ; the same notch is present in the Spigelian lobe, 

 though it is less well marked. 



The Pancreas is about 6 inches long, its head is surrounded by 

 the duodenum, while the long thin tail reaches the spleen. 



The Small Intestine is 8 ft. 6 in. long, the Large, 3 ft. 8 m. ; this 

 is about the same proportion that Beddard describes in Dendro- 

 lagus. Garrod ' says that in Dorcopsis luctuosa the large intestine 

 is one-third the length of the small ; in Petrogale, however, the 

 proportion is greater. The bUe-duct opens into the duodenum 

 3 inches from the pylorus, the pancreatic cjuct just beyond. In 

 the Great Kangaroo, Owen says that the bile and pancreatic ducts 

 unite and open 5 inches from the pylorus. 



The Ccecum is 6 inches long, and is not sacculated as Owen 

 describes it in the Great Kangaroo ; its calibre is greater than tliat 

 of the rest of the colon ; the Seum joins it at an acute angle, and. 



' 'Anatomy of Vertebrates,' toI. iii. p. 385. 

 = P. Z. S. 1895, p. 131. 

 ' P. Z. S. 1875, p. 56. 

 Peoc. Zool. Soc— 1896, No. XLVI. 46 



