of the Fishery Board for Scotland. 



59 



On the ventral edge of the body, between the second anal and the caudal 

 fins, there was a small sore (so. fig. 61). This may have been caused by 

 some of the secretion having become attached at that point under shelter of 

 the fins. 



A whiting had a partially healed sore. The scar was 3 cm. in diameter, 

 and seemed to have resulted from a tumour similar to that just described. 



'Tumours on the Lemon Sole (Pleuronectes microcephalus). 



Tumours resembling that just described were found on a Lemon Sole in 

 the spring of 1909 (fig. 66). Three of the sores represented a secondary 

 condition in which the diseased skin had been removed either partially or 

 wholly, as in the case of the most posterior tumour where the muscles are 

 exposed. 



The fish had been in formaline for some time before it was examined. 



One tumour had a long process lying on the top of the skin (tu.). A 

 longitudinal section was made through the tumour (fig. 69). It showed 

 what appeared to be a group of cysts between which the derma was inter- 

 digitated. The cysts are, however, no doubt simply the solidified secretion. 

 The solid is finely" granular. The external process was granular in structure 

 and was probably coagulated secretion. A scale from the outside of a part 

 of the tumour was partly eaten away. It is shown semi-diagrammatically 

 in fig. 56. 



Disease in ike Shin of Onos mustela. 



In this connection it may be noted that a disease appeared in the skin of 

 a five-bearded rockling a few days after the fish had bevn handled. 



The fish, which was living in one of the tanks of the Laboratory, had 

 become ripe. It was, however, unable to get rid of its eggs, and the 

 abdomen became very much distended. I caused a considerable quantity 

 of the ova to flow out by passing my fingers from before backwards along 

 the side of the abdomen a number of times. The fish was replaced in 

 the tank, and in a few days the skin over the region that had been rubbed 

 was very much inflamed. When examined it was found that the epidermis 

 was absent from the region. 



Tumours in a Zoarces viviparus. 



A viviparous Blenny (Zoarces viviparus) was obtained from the estuary of 

 the Dee. Its body was much distended, and it was kept alive as it was 

 thought to be carrying young (fig. 43). It died at the end of several 

 months' stay in the tank, and when opened the swelling of the abdomen was 

 found to be due to tumours which w 7 ere located in the abdominal wall 

 (T. T.' figs. 36 and 43). They projected into the abdomen and reduced the 

 cavity very much. The two hind tumours (TV fig. 36) met in the hind part 

 of the abdomen. The abdominal organs were crashed to one side in the 

 anterior region. A number of tumours were present in the tail portion of 

 the body. The fish was sent to Dr. F. M. Milne, Pathological Department, 

 University College, Dundee. From a preliminary examination he concluded 

 that the tumours do not suggest a true new formation of tissue, but rather 

 something parasitic (sporidial). 



Spotted Whiting (Gadus merlangus), Cod (Gadus callarias), and Lythe 

 (Gadus pollachius). (Figs. 24, 30, 32, 33.) 



Four spotted whitings were obtained at Aberdeen in October and 

 November 1909. They measured from 12| inches (31 cm.) to 16 inches 

 (40 cm.) in length. One of them is shown reduced in fig. 24, 



