of the Fishery Hoard for Scotland, 
V.— ON TWO LARGE TUMOURS IN A HADDOCK AND A COD. 
(Plate XVII.) 
I. Description of a Melanotic Tumour on a Haddock. By Professor 
Prince, B.A., F.L.S., St Mungo's College, Glasgow. 
II. Microscopical Features of the same. By Dr. J. Lindsay Steven, 
Lecturer on Pathology, St Mungo's College, and Pathologist to 
the Royal Infirmary, Glasgow. 
III. On an Internal Tumour from the Abdomen of a Cod. By Professor 
Prince. 
On the 16th March 1892 a haddock, 2 feet long, was brought to tho 
St Andrews Marine Laboratory with a large tumour on the side of the 
caudal trunk. The fish was thin and out of condition, the cranial bones 
being prominent, and the facies diagnostic. The surface of the tail on 
both sides behind the tumour was congested, resembling in colour a red 
mullet. The specimen was a female, with the ovaries approaching 
maturity. The liver was pale and atrophied. The ulcerated surface of 
the tumour presented in the fresh condition masses of pigment and multi- 
tudes of small cells with fibroid streaks here and there.— [w. c. m.]. 
I. Description of the Tumour. By Professor Prince. 
(Plate XVII. fig. 1.) 
The tumour, which projected from the caudal trunk about half an inch 
below the lateral line, had the form of a short stout cylinder. Its 
posterior margin was 6 inches from the middle of the free edge of the 
caudal fin. The caudal fin itself was seriously abraded, and had evidently 
been worn away greatly by contact with the sea-bottom. At its base the 
tumour was 7| inches round, and about the same in circumference at the 
upper margin. It was 2 inches in height, and much of the surface was 
ulcerated and presented a reddish raw appearance. Extensive black 
patches occurred towards the dorsal side, one, anteriorly, measuring 
-j^- in. x | in., another 1 J in. x J in., and the third, towards the upper 
posterior edge, measured in. in diameter. Around the base of the 
tumour the scaly integument was raised up, but the silvery appearance 
ceased at J inch to 1J inches from the rim, and the flesh-coloured corium 
continued to the ulcerated surface. The tumour, in pushing its way out- 
ward, thus left the layers of the integument behind, and naked cutis alone 
occurred at the flattened top. Digital examination showed that it 
did not penetrate the muscles of the interspinous bones beneath, though 
it lay immediately above the first anal fin, and trenched for a distance of 
1J inches upon the base of the second anal fin. The latter fin was not 
displaced from its normal median position, but the first anal was pushed 
so far from its place as to impart to the caudal trunk a flattened face on 
the side opposite the tumour. All the neighbouring tissue showed a con- 
gested appearance, but the muscles mainly affected were those forming the 
left ventral band, i.e., the imperfect lower investing cone. Little dissection 
was made in order to keep this curious pathological specimen in an un- 
injured state, but examination sufficiently showed that the tumour was 
seated upon the surface of the caudal muscles and enveloped mainly by 
the corium. To the touch the tumour was very hard, and on account of 
