76 DISEASE IN WILD MAMMALS AND BIRDS 
The lesions in the Artiodactyla are both in plaques 
and diffuse, the aorta and its branches sometimes being 
quite wrinkled but beset with firm elevations with and 
without calcification. These changes are fairly definite 
and, although they never attain the development seen in 
man, resemble the stage of wrinkling and roughness in 
the preulcerative stage of the human analogue. Two of 
the cases were associated with dilatations of the mesen- 
teric vessels and with periarteritis, a picture strongly 
suggesting parasitic infestation ; in one case ineffectual 
search was made, in the other no record is made of the 
parasites. Renal disease occurred only twdce and myo- 
cardial damage only once. Chronic pulmonary disease, 
present thrice, took the form of tuberculosis twice and 
pleural adhesions mth atelectasis once. 
^klarsupialia present three quite interesting cases, a 
Tasmanian Devil {Sarcophilus ur sinus) and two Kanga- 
roos (Macropiis). The first showed distinct sacculations 
in the ascending aorta, suggestive of Monckeberg's 
sclerosis but equally resembling several small or incom- 
plete aneurysms. The underlying vessel was opaque and 
stiff, continuing so to the middle of the thoracic portion. 
The other marsupials showed distinct mesial damage 
with early calcification and a roughened intima ; once the 
pulmonary artery was involved. 
It ^\^ll be noticed that the orders Rodentia and 
Lemures are missing from those showing arterial disease 
although we have a reasonable number of autopsies 
upon them. 
Passeres are hardly good exponents of vascular 
disease, an interesting thing in view of their large heart, 
heavy vessels, and flying habits. It is, however, striking 
that two of the three birds of this group had aneurysms of 
the aorta, one of which ruptured just above the origin, 
partly into and partly outside the pericardium. Despite 
several microscopical sections we were unable to find the 
tiny ends of the breach and any evidence of parasites. In 
