218 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Fig. 4. Phycomycetous fungus in Mackerel. A group 

 of small cysts attached to the peritoneum 

 over the pyloric caeca. The remains of the 

 peritoneum are represented by the fibrous 

 structures connecting the cysts. The 

 diameter of the largest cyst is about 

 004 mm. 



Fig. 5. Sarcomatous tumour in Skate. Section of a 

 fully-developed tumour. Rounded cells 

 with melanin granules. Rounded cells 

 with clear granules, or almost homogeneous 

 cell substance. Broken-down cells and 

 diffuse melanin granules. Zeiss apochro- 

 matic 2 mm. 



Fig. 6. Sarcomatous tumour in Skate. Section of the 

 edge of one of the larger tumours — the 

 elongated bodies are muscle fibres in 

 longitudinal section. The finely-stippled 

 parts are the hypertrophied connective 

 tissue; the darker-stippled parts represent 

 the tumour. Zeiss AA. 



Plate III. 

 Fig. 1. Ovarian cysts in Lophius. Natural size. 

 Fig. 2. Cod with tuberculous lesions in the skin. 



Half natural size. 

 Fig. 3, Sarcomatous tumour from Skate. Hand 

 section through part of a pectoral fin 

 showing tumour in situ. Natural size* 

 Photos, by A. Scott. 



