SEA-FISHERIES LABORATORY. 141 



seen extensive crystallisation of the haemoglobin in the 

 case of a plaice which died in the tanks at Port Erin, 

 and which had ulcerated patches on its skin. 



Elsewhere the growth has the characters already 

 described, with some modification. It is mostly fibrous, 

 sometimes finely fibrous, but at other times the structure 

 is very coarse and the fibres seem to be swollen and 

 degenerate, undergoing some kind of colloidal change. 

 Here and there are patches, or nodules of proliferation, 

 when there are very numerous small round cells. We 

 conclude that the growth is a cutaneous papilloma — a 

 kind of gigantic wart; with indications of a tendency 

 to the production of local malignancy. 



EXPLANATION OF THE PLATES. 



Plate I, figs. 1-7. 

 Coenomorphus linguatula (van Beneden).* 



Fig. 1. Ganglionic part of the central nervous system. 

 Zeiss apochromatic 1*5 mm. 



Fig. 2. The animal in the extended condition. 

 Slightly reduced. 



Fig. 3. The anterior part of the Scolex. Recon- 

 structed from serial sections, and seen from 

 the " dorsal " surface. Only two of the 

 proboscides, and two proboscidial bulbs and 

 sheaths are represented. Mag. about 10 dia. 



Fig. 4. The central nervous system. The parenchy- 

 mal ground tissue is all that is represented 

 in addition to a ganglion cell and an excretory 

 canal. Zeiss apochromatic 1'5 mm. 



• Tetrarhynchus mcgacephalus, Rud., may be the final form of 

 Coe7iomorphus. 



