THE ALIMENTARY TRACT 221 
epithelial nests and distorted acini, around which are 
sharply outlined spaces, tilled with the remains of de- 
generated blood or a granular material. The metastases 
are always sharply outlined. 
Aves supply three papillomata which are interesting 
in that one occurred in the proventricle, and two grew in 
the duodenum in the vicinity of the upper biliary opening 
and presented within the lumen soft masses which, while 
not occluding the passage, offered some little obstruction 
as indicated by a slight distention above their location. In 
two, carefully studied, no indications of parasites or of 
cancer could be found. The birds concerned were an 
amazon, an owl, and a rhea. 
