SEA-FISHERIES LABORATORY. 109 



" cheesy," and present an obvious lamination in their 

 marginal parts. Generally they are very similar to the 

 substance of the ovarian concretion which I described in 

 last year's Eeport* ; and like that, are probably composed, 

 typically, of a sclero-proteid substance. 



Plate I illustrates the minute anatomy of this ovary. 

 First of all, the massive tissues are composed of fibrous 

 tissue such as that represented in fig. 4. The fibres are 

 short and thick, and usually slightly convoluted. In 

 some places they tend to run concentrically round nuclei 

 of formation. Among them are a few cells of various 

 sizes. The greater part of the structure is therefore a 

 fibroma . 



Fig. 3 represents the structure of the epithelium 

 lining the mucous cysts. The sjiecinieii had been fixed 

 in formalin only, so that the finer details of structure are 

 not favourably exhibited. Probably some disintegration 

 of the epithelium has taken place. It appears, indeed, 

 as if a goblet-celled layer may have been present, and had 

 latterly been broken up with the process of secretion of 

 the liquid filling the cysts. In the sections made there is 

 only a structureless layer containing, here and there, 

 some migrant leucocytes. Below this is a layer of areolar 

 tissue of the usual kind. This is, in places, infiltrated 

 with leucocytes. Below this is the fibrous tissue described 

 above. 



Fig. 2 represents a part of a section of Hie 

 massive tissue containing a cavity, evidently of the same 

 nature as those of the mucus-containing cells. Within 

 it is the section of a body of different nature. Fig. 1 

 represents the marginal part of a section of this 

 body. Centrally it is very similar in structure to the 



• .)////. Rcpt. Lancashire Sea Fish. Laboratory for L913; pp. 41-48, 

 pi. III. Liverpool, 1914. (In Traits. Liverpool Biological tioc, Vol. 28, 1914.) 



