276 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



The scolex, which is represented in fig. 12 is large 

 and very regular in shape, suggesting a four-petaled 

 flower. There is no myzorhynchus. There are four long 

 mobile pedicels, each of which carries a shallow cup- 

 shaped bothrium — this is never trumpet-shaped. The 

 internal margins of the bothria have thickened rims with 

 a notch in the middle, but the external margins are very 

 thin. On the internal margin of each bothrium is a small 

 auxiliary sucker, which is not conspicuous and may easily 

 be overlooked. In the centre of each bothrium is an 

 irregular rosette-shaped patch, which appears to represent 

 a radial arrangement of muscle bands, such as is 

 represented in van Beneden's figure 3, but the precise 

 disposition of the muscle bundles shown there does not 

 appear in my specimens. Round this is an annular band 

 of muscles. 



Tetrarhynchus erinaceus, van Beneden. 



An interesting addition to the intermediate hosts of 

 this tapeworm is the Halibut, Hippoglossus vulgaris. Two 

 specimens of pieces of halibut flesh were sent to this 

 laboratory from the Board of Agriculture and Fisheries. 

 In one case the flesh was abundantly infested with the 

 plerocercoid larvae of the cestode, and in the other case a 

 similar infection had taken place, but the larvae were 

 restricted to the muscles round the vertebral column. 

 The cysts containing larvae were unusually large, and 

 were usually present in tubular cavities in the muscle 

 tissue. Many larvae were in process of disintegration, 

 and in some cases the cyst contained nothing but a mass 

 of calcareous granules. Usually plerocercoid larvae of 

 T. erinaceus are adherent to the peritoneum and projecting 

 into the body cavity, and the general infection of the 

 flesh is apparently a rare condition. 



