The fish, a gold carp, was obtained alive from a garden-pool of a hotel at St. Augustine, Florida; it died during transport, so that the study of the tumors was necessarily confined to a purely anatomical investigation. The pool contained very strongly sulphurous water, and was lined with rough, jagged rocks. The fish had lived in it for at least fifteen years; there were 4 other gold carp in the pool, all of which were apparently healthy.

GROSS DESCRIPTION

Female gold carp, 27 cm. in length, fully developed and well nourished. There are 3 tumors on the right side of the body all having broken through the epiderm (fig. 1). The largest is situated just laterally and somewhat anteriorly to the cephalic border of the dorsal fin. It is moderately firm, round in shape, measures 26 mm. in diameter and projects 15 mm. above the surface of the skin. In appearance it is dull white, its surface is generally smooth, but here and there are superficial ulcerations. At the periphery there is a number of fringe-like projections which extend like buttresses into the neighboring superficial tissue. The cut surface is dull white and almost homogeneous. In places, however, the tissue seems to be gathered into bundles which have a whorled arrangement. The bulk of the tumor is definitely external to the corium, but a considerable portion extends into the musculature and the tissues about the vertebral column. From gross examination it is not only impossible to decide its origin, but it is also difficult to judge as to whether the growth arises in the deep tissue and extends outwards, or whether the reverse is the case.

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