NEW GROWTHS IN FISH. 287 



Fig. 2 X f^. As Fig. 1, but showing position of tumour on the fin. 



Fig. 3 X 150. Section of tumour shown in Figs. 1 and 2. Irregular strands of 



fibrous tissue are j^resent, with numbers of small round sarcomatous 



cells. 

 Fig. 4 X ^. Photograph of Whiting, showing position of the tumour. 

 Fig. 5 X 150. Section of tumour shown in Fig. 4. A fine reticulum of a fibrous 



nature forms the groundwork of the growth, and small round 



cells are situated on the strands forming this reticulum. Spaces 



containing corpuscles are present. 

 Fig. 6 X 400. Section of endothelioma of Eel. Masses of endothelial cells divided 



by irregular spaces containing blood corpuscles are present, 



together with some blood spaces with more definite walls. 

 (N.B. — For the sake of clearness the red blood corpuscles are represented with 

 dense black nuclei, showing none of their nuclear structure.) 



