Abstract
The author made a histological study of the tumor which grew in the muscular tissue of the lateral wall of abdominal cavity of a chum salmon. The following results were obtained. (1) The shapes of the cells in the tumor were round, oval or spindle. (2) From the various observations it was considered that the tumor developed in muscular tissue and grew into the kidney tissue with a infiltrative growth. (3) There was no clear difference between parenchyma and stroma in the tumor, which was, then, considered to be nonepitherial. (4) The study suggested the tumor as polymorphic-cell sarcoma.
