MALIGNANT TUMOURS IN ANIMALS. 



589 



the stomach was found to contain an enormous cancer, which had 

 remained completely latent. The new growth occupied the left side 

 of the stomach, and was irregularly triangular in form, with its base 





Fig. 93. — Epithelioma of the peri-anal gland (bitch). 



uppermost ; it measured ten and a quarter inches in length, and nine 

 and a half inches in breadth ; its surface was ulcerated and covered 

 with reddish mammillated vegetations. The lesion, which had 

 extended three eighths of an inch into the cesophagus, stopped 

 abruptly at the Jine of separation between the cuticular and villous 

 portions of the gastric mucous membrane, altogether avoiding the 

 latter. At its margin the wall of the stomach was thickened, indu- 

 rated, and in places oedematous. The growth occupied that portion 

 of the gastric mucous membrane which in the horse is continuous 



Fig. 94. 



Sebaceous epithelioma (dog). 



with the cesophagus. Microscopic examination showed, as a know- 

 ledge of anatomy would lead one to anticipate, that the tumour was of 

 the pavement epitheliomatous type (Fig. 92). 



