[ 281 ] ^' 



Some Cases of New Growths in Fish. 



By 

 Gr. Harold Drew, 



Beit Memorial Research Fellow. 

 With Plate IV. 



TABLE OF CONTENTS. 



PACK 



281 

 282 

 284 

 284 



A Fibro-sarcoma of Raia macrorhynchus 



An Endothelioma of an Eel (Conger vulgaris) 



A Fibro-sarcoma of a Plaice (Pleuronectes platessa) 



A Tumour of a Whiting (Gadus merlangus) . 



Haemangiomata of a Spotted Ray (Raia maculata) and of a Gurnard (Trigla lineata) 285 



A pigmented Tumour of a Mackerel (Scomber scomber) of inflammatory origin . 285 



A FIBKO-SARCOMA OF EAIA MACROEHYNCHUS. 

 This specimen, obtained from one of the Plymouth trawlers, consisted 

 of a large tumour on the dorsal surface, near the left angle of the fin 

 (see Figs. 1 and 2). Only part of the fish was available for examina- 

 tion, so the presence of metastases and other details could not be 

 determined. 



The tumour was roughly circular, measuring about 4 inches in 

 diameter, and was elevated above the skin about 1^ inches. It 

 consisted of a broad central pedicle, hard and fibrous and white 

 in colour, surrounded by a broad cauliflower-like mass of a greyish 

 colour, and of much softer consistency than the central mass. This 

 peripheral part of the tumour was covered by a very thin layer of 

 epithelium which lined the outside of the pedicle and was continuous 

 with the epidermis ; it extended into all the folds and hollows of the 

 outer papilliform portion of the tumour, but was absent over the flat 

 upper extremity of the pedicle. 



An incision made along a diameter of the growth, and carried down 

 into the tissues of the fish, revealed the fact that the tumour arose 

 from the fibrous perichondrium of one of the fin rays. The central 

 mass consisted of closely packed strands of white fibrous tissue of 

 pearly whiteness, running at first in a direction perpendicular to the 

 skin, and then branching out into the surrounding ring of softer tissue. 



Sections of the pedicle showed that it consisted of strands of typical 

 white fibrous tissue ; these were closely packed, but a few small round 

 cells, having a somewhat indefinite nucleus, and little or no cytoplasm, 

 were present between the fibres, and occasionally the elongated nuclei of 



NEW SERIES.— VOL. IX, NO. 3. JUNE, 1912, T 



