SEA-FISHERIES LABORATORY. 143 



Fig. 5. Melanotic sarcoma from Raia clavata. Cells 

 of rather irregular shape showing a tendency 

 to spindle formations. Marked connective 

 tissue stroma. The darkly shaded object is 

 part of a connective tissue fibre. 



Fig. 6. Lympho-sarcoma from the eye of Pleuronectes 

 flesus. Fibrous part of the growth, showing 

 colloidal swelling and fusions. 



Fig. 7. The same ; an enlarged connective tissue fibre 

 showing a reticular structure. Fine meshed 

 reticulum enclosing leucocytes. 



Fig. 8. Fibroma growing on the integument of the eye 

 of Raia clavata. Coarse fibrous tissue with 

 few cells. 



Plate III, figs. 1-8. 

 Morbid histology of fishes. 



Fig. 1. Lympho-sarcoma from the eye of Pleuronectes 

 flesus. Lymph space containing leucocytes, 

 some of which contain melanin. A smaller 

 lymph space on the right containing leucocytes 

 most of which are adherent to the walls. 



Fig. 2. Myxo-fibroma from Raia clavata. Fine fibrous 

 tissue running in all directions. A blood- 

 vessel containing several blood corpuscles and 

 a leucocyte. Numerous leucocytes in the 

 tissue surrounding the vessel. 



Fig. 3. The epithelium covering the myxo-fibromata 

 sectioned in fig. 2. Columnar cells, with 

 interpolated mucus cells, resting on a coarse 

 connective tissue stroma, containing cells in 

 its interstices. 



