1896.] ANATOMY OF PETROGALE XANTHOPUS. 713 
marked on the posterior part of the dorsum. Foliate papille are 
present in their normal position but are feebly marked. There 
are three circumyallate papille, the central one being well marked, 
while the lateral ones are indistinct and situated just in front of 
the papillz foliate. 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 Gland, as is usual in the Macropodida, 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 Submawillary 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 @sophagus is long and narrow and has a considerable course 
in the abdomen. 
The Stomach of Petrogale penicillata has been carefully examined 
by Beddard and contrasted with that of Dendrolagus bennettii?. 
The stomach of Petrogale wanthopus 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 54 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 Petrogale penicillata has been figured by Beddard : 
the arrangement of its labes 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 in. ; 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 bile-duct opens into the duodenum 
3 inches from the pylorus, the pancreatic duct just beyond. In 
the Great Kangaroo, Owen says that the bile and pancreatic ducts 
unite and open 5 inches from the pylorus. 
The Caecum is 6 inches long, and is not sacculated as Owen 
describes it in the Great Kangaroo; its calibre is greater than that 
of the rest of the colon; the ileum joins it at an acute angle, and 
* ‘Anatomy of Vertebrates,’ vol. iii. p. 885. 
* P. Z. 8. 1895, p. 131. 
3 P. Z. 8. 1875, p. 56. 
~ Proc, Zoon, Soc.—1896, No. XLVI, 46 
