Report on Diseases and Abnormalities in Fishes. 13 



measured about '12 by -1 mm. and "15 mm. Except for the 

 difference in colour, they looked just like the corresponding bodies 

 in the tusk. 



The skin of the swim-bladder next the kidney was inflamed, and 

 a small quantity of green pus-like matter was present inside the 

 swim-bladder. 



Cod — Normal Kidney. — The normal kidney of the cod is a mass 

 of thin-walled tubules (tubuli uriniferi) embedded in a dark red 

 loose cellular tissue (fig. 157). The tubules are convoluted, and 

 they contain corpuscles. They end, in some cases, in round 

 swellings. A small spore-like body was found in a normal kidney 

 (sp., figs. 156 and 157). It measured - 07 mm. in diameter. No 

 colour was made out in it. In another part of the kidney a cyst was 

 found measuring about 35 mm. in diameter. 



Saithe (Gadus virens). — The kidney was replaced by a soft white 

 mass, which, on washing in water, showed a ramifying fibrous body, 

 the tubules of the kidney. The normal kidney shows the rounded, 

 spirally-arranged tubules filled with corpuscles and embedded in the 

 mass of red cells , 



In one part at the exterior of the tumour, i.e., where it was 

 covered by the swim-bladd»er, a collection of brown bodies was 

 visible. The semi-fluid white material of the tumour washed to a 

 flocculent fibrous material. In some parts of the kidney, when the 

 vessels were washed out, very fine hypha-like fibres were seen pro- 

 jecting from the vessels. A columnar-shaped body was observed 

 among the diseased tissue. 



None of the large blood-vessels seems to have been severed. 



Saithe. — A large tumour on the anterior part of the kidney 

 pressed out into the abdominal cavity, and also out between the 

 lateral processes of the vertebrae into the muscles of the trunk. On 

 cutting into the tumour, a thick white matter exuded. 



The tumour had evidently been of long standing, for the spaces 

 between the lateral processes of certain vertebrae had been increased 

 in size by the deflection of the vertebral processes (fig. 118). The 

 spaces marked t. had been occupied by the tumour. Some of the 

 ribs had been displaced also. And in the case of one rib (v 4 .), where 

 the rib had been forced a considerable distance away from the 

 lateral processes, a little intermediary bone (6.) had been formed. 

 The ligaments are marked la. 



Another case of tumour of the kidney was found in a large saithe.* 

 The tumour projected into the abdominal cavity on the right side 

 of the swim-bladder (tu., fig. 116). The diseased part of the kidney 

 was white instead of being red. The diseased portion (tumour) 

 ends and the normally-coloured kidney begins at a division between 

 two vertebrae. Little cyst-like bodies are present in the tumour 

 next the bone. In the same part are little white nodules and single 

 cells coloured brown. There is a small quantity of brown pigment 

 present also. 



The tumour had grown out into the abdominal cavity, and also 

 into the lateral trunk muscles. In the abdominal cavity it was 

 covered with the peritoneum, and under that with the tough 

 aponeurosis which covers the muscles connecting the ribs. This 



* Presented by Mr. Paterson. 



