166 PROF, W. H. FLOWER ON THE MUSK-DEER. [Mar. 16, 
(though rather smaller), and an upper triangular portion, very much 
smalier than the right upper lobe*. 
The lungs, posterior aspect; half natural size. 
LU, \eft wpper lobe; ZL, left lower lobe; RU, RM, and RL, right upper, 
middle, and lower lobes; 4, azygos lobe. 
The heart (fig. 5) is an elongated cone in form, measuring 22! in 
length, 1-9 from side to side at greatest breadth, and 13" from before 
backwards when undistended. 
A single common anterior arterial trunk is given off from the aorta 
at its commencement. After a course of 1”°3 in length, and having 
a diameter of 0!'-27, this gives off the left brachial (Z B) from which 
the left vertebral is derived (ZV). About a quarter of an inch beyond, 
the right brachial (R B) comes off ; and immediately after, the trunk 
bifurcates into the two common carotids (R C and LC). The right 
vertebral (RV) is given off from the innominate trunk behind the 
origin of the right subclavian f. 
* The lungs of the Pudu have the same general arrangement as those of 
Moschus; but the right middle lobe is very little divided from the right lower. 
t In the Pudu, the anterior aortic trunk proceeds for 0'"9, then gives off the 
left brachial, then after a further course of 0'°5 gives off the right brachial and 
