SEA-FISHERIES LABORATORY. 297 



Iii one case one of these concretions was surrounded 

 by a nematode coiled in two or three turns (fig. 10). In the 

 centre round the concretion,, between this and the worm, 

 and between the coils of the worm itself, is a quantity of 

 granular tissue. The whole structure is surrounded with 

 a kind of capsule, evidently derived from the peritoneum, 

 to which it is attached by a pedicle, as in the other cases. 



Fig. 10. Pearl-like concretion with nematode coiled round it. 

 x 80 dia. 



These structures are probably to be derived from the 



Tetrarhynclms cysts. In all cases the proximal ends of 



these cysts are pigmented and attached. If the enclosed 



larva should escape from the cysts, and the latter should 



undergo a kind of degeneration, the structure described 



would probably be formed. In one case the Tetrarhynclms 



cyst contained also a coiled nematode worm. 



Flounders with Wounds Inflicted by Lampreys. 

 Flounders bearing wounds resulting from the bites of 

 lampreys are not uncommon in the Lune, though we have 

 not been able so far to get a fish with the larnjDrey still 

 attached. A flounder with such a wound is represented 

 in fig. 11. The wound was nearly circular and about 

 li mm. in diameter. It was clean and showed indications of 

 healing, so that the lamprey had probably been detached 

 for some time. 



