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TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY 



specimen in which the bothria have undergone extreme 

 contraction and the head has assumed a spherical appear- 

 ance, presenting very little indication of the true shape of 



Fig. 15. Phyllobothrium lactuca, van Ben. Scolex seen from beneath. 



Mag. 18 dia. 



the bothria. Fig. 15 is drawn from a specimen which 

 was killed in fresh water and shows the bothria fully 

 expanded. The head is seen from underneath, being bent 

 over at right angles to the longitudinal axis of the 

 strobila; and fig. 16 is a view of the same scolex seen 



Fig. 16. Phyllobothrium lactuca, van Ben. Scolex seen from above. 

 Mag. 18 dia. 



