PETAURUS TAGUANOIDES. 255 



on a very thin mesentery. The ileum passes to the right side and 

 enters the colon, which is large. The csecum is a pretty large and wide 

 bag, lying on the lower and right side of the pelvis. The colon passes 

 up the right side, then crosses the body to the left, and then down the 

 left to the pelvis. In all this track it is very loose, or thrown into long 

 convolutions, not folds, especially when it crosses the body. It has a 

 long or broad and thin mesocolon, which is continued down the back, 

 attaching the descending colon to the back, to which the last turn of 

 the duodenum is also attached. 



The liver is divided into four lobes ; the second from the left is the 

 largest, in a sulcus of which the gall-bladder lies : the two right lobes 

 are small: the second lobe from the left is continued in behind the 

 mesogaster, making what might be called the Spigelian lobe, but it is 

 not a distinct lobe. The pancreas comes from the spleen on the left 

 side, and follows the curve of the duodenum. The kidneys are con- 

 globate. 



The lungs on the left side have one lobe with a fissure on the anterior 

 and upper edge ; on the right side there are two or three deep fissures, 

 and a lobulus medius. 



The left subclavian and jugular veins pass, after joining, round the 

 base of the heart on the left side, to enter into the right auricle, as in 

 the kangaroo [and the rest of the Marsupialia]. 



The parotid gland is extremely large, passing down from the ear as 

 far as the clavicle 1 . 



The Hepoona Uoo [Petaurus taguanoides, Desm.]. 



This animal is of the size of a small rabbit, having a broad flat body : 

 the head is like that of a squirrel : the eyes are prominent and large, 

 the ears broad and thin : the legs are short, and the tail is very long. 



Between the fore- and hind-legs is placed on each side a doubling of 

 the skin of the side, which, when the legs are extended laterally, is, as 

 it were, pulled out, forming a broad lateral wing or web : when the 

 legs are situated as for walking, this skin by its elasticity is drawn close 

 to the side of the animal, yet forms there a kind of ridge on which the 

 hair is different : this is very similar to the grey squirrel of America. 

 It has five toes on each fore-foot with sharp nails. The hind-foot has 

 also five toes, but here is a considerable difference between them and 

 the toes of the fore-foot : the inner hind-toe may be called a thumb 



1 [The male organs of the Hypsiprymnus murinus are No. 2478, the female organs 

 No. 2741, Hunt. Physiol. Series. The skull is No. 1780, Osteol. Series.] 



