160 



specimen in M'hieli the boiliria have undergone extreme 

 eontraction and the head has assumed a spherical appear- 

 ance, presenting very littJe indication of the true shape of 



Pig. Ifi. PJii/llohotliriiiiii lactuca, van Ben. Scolex seen from beneath. 



Mag. 18 dia. 



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

 was kiUed in fresli 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. IG is a view of the same scolex seen 



Fig. 16. PhyUohothrinm lactuca. van Ben. Scolex seen from above. 



Mao-. 18 (lia. 



