46 
2793. Azara's Agouti {Dasyprocta azara) : 
Squamous cell carcinoma of larynx. 
Over the false vocal cords slightly to the left of the 
anterior median line there is a dirty gray necrotic 
ulceration 3x4 cm., not very deep and poorly 
outlined. There is general congestion of the mu- 
cosa. The trachea shows engorgement of veins 
externally. They are blue. 
The microscopical section consists of a much con- 
torted mucous membrane, whose submucosa is at 
times underlaid by cartilage and mucous glands, 
at others by muscle only. The epithelium 
throughout is stratified squamous. There is an 
infiltration of the muscle fibers at one end of the 
section. Such muscle fibers lack their transverse 
striae and nuclei and have a smooth, homogeneous 
appearance. They are of all widths. The infil- 
trating cells are large, polygonal, and have large, 
deeply-staining nuclei. They are arranged for the 
most part in solid plugs. 
2831. Isabelline Gazelle {Gazella isabella): 
Osteofibroma of jaw. 
Springing from the right upper alveolar border is a 
firm, well-encapsulated, smooth, flesh-red tumor. 
It measures 7x4x4 cm. It has the shape of an 
elongated egg. Its attachment to the alveolus of 
the jaw is broad and the tissue of the tumor 
passes directly over into a similar dense firm tis- 
sue of the gum, so that the tumor cannot be 
shelled out. The tumor cuts with resistance. 
The cut surface has a pale, flesh-red granular ap- 
pearance and does not show the characteristic 
classical whorls of fibroma. The hard palate 
bears a similar smaller mass, which is elongated 
posteriorly. The left alveolar process shows a 
third similar tumor intermediate in size between 
these two. 
