SEA-FISHERIES LABORATORY. 117 



Fig. 6. Normal tissue such as forms the locus of these 

 tumours. Essentially muscular tissue with 

 much loose fibrous tissue between the muscle 

 bundles. There is usually extensive fat forma- 

 tion. A vessel, blood-capillary or gorged 

 lymph-capillary, is shown. Apochromatic lens. 



Plate IV. Ovarian Cystadenoma in a Ling. 



The whole ovary, about ± natural size. 

 Photo, by A. Scott. 



Plate V. 



Fig. 1. Plaice with one eye. Natural size. 



Fig. 2. Two inclusions from the cysts shown in the 

 photograph above (PI. IY). Slightly enlarged. 



Plate VI. 



Fig. 1. Haemangioma in a Stickleback. Section through 

 the fully-developed tumour. Engorged and 

 dilated blood capillaries without interstitial 

 tissue. Oil-immersion lens. 



Fig. 2. The same. Part of the same section where the 

 capillary plexus was looser. Some of the 

 contents of the vessels are removed in the 

 process of preparing the section. The vessels 

 contain typical red blood corpuscles. Oil- 

 immersion lens. 



Fig. 3. Sarcoma in a Cod. Section of the tumour in 

 the muscles adjacent to the degenerated 

 tumour. Spindle and oat-shaped cells, witli 

 nuclei due to coalescence of the cells. Oii- 

 immersion lens. 



