336 DISEASE IN WILD MAMMALS AND BIRDS 
is easily identified. It varies from normal in that its spaces are often 
very large, contain villus projections or may be completely filled by 
large compound granule cells with no colloid. Other acini are atypical 
and contain typical colloid. Continuous to such thyroid tissue is a 
very large, rounded tumor. It consists of round cells with round 
nuclei in which many mitotic figures may be seen. An arrangement 
into acini cannot be made out nor is colloid material abundant. In 
one or two places an irregular collection of such material may be seen 
with peripheral vacuolization but its confines are always indefinite. 
As far as section goes the mass is well encapsulated but the lymphatics 
are infiltrated by the tumor cells. The tumor, too, is sharply separated 
from the relatively normal thyroid. Irregularly scattered through 
section are remarkable cells with nuclei three or four times the size 
of other nuclei. They may be hyperchromatic or normally staining. 
(Figs. 38 and 39.) 
The THYMUS BODY is a structure encountered in our 
specimens with greater regularity than is the case in 
human autopsy experience. However, no great size of the 
gland is observed, and there is no record or recollection of 
anything which could resemble an enlargement suggest- 
ing status thymicolymphaticus nor has a timior with this 
organ as its origin been observed. In one case only did 
the thymus present what was believed to be an unusual 
size. An adult Gray Lagothrix {Lagothrix lagotricha) 
died with an acute intestinal infection. Its thymus was a 
large, soft, deep pink body lying in the anterior mediasti- 
num, running up to the clavicular joints and down along 
the sternum. The death had ample explanation without 
any state of this organ. The thymus body has not been 
found enlarged in association with thyroid disease. 
The SUPRARENAL, or ADRENAL BODY is au orgau of essen- 
tially the same general construction in the two classes 
here studied except that in birds the cortical portion may 
be imperfectly developed and in some of the lower groups 
is decidedly narrow. This outer zone may indeed be 
entirely missing since tissue comparable to it is dis- 
tributed elsewhere in the body, notably with ganglia along 
the vertebral column. The organ is infrequently the seat 
of alterations, detectable either grossly or microscopi- 
cally. Congestion and small hemorrhages are rather 
