300 TRANSACTIONS LIVERPOOL. BIOLOGICAL SOCIETY. 



P. J. van Benedeii in diagnosing the genus says : 

 " The four bothria are each armed with two hooks, united 

 at their bases and bifurcated at the apices." I have not 

 been able to see this union of the hooks. The extremities 

 (fig. 13) are closely apposed and one seems to fit into the 



Fig. 13. Acanthobothrium coronatum, van Ben. Scolex mag. 22 

 dia., hooks mag. 200 dia. 



other, forming a kind of ball and socket joint. There is 

 apparently no fusion of the substance of these structures. 



Calliobothrium verticillatum, Budolpni.— Figs. 14. 



Host : Galeus vulgaris, Cardigan Bay. 



P. J. van Benedeii recorded this species from Galeus 

 canis, Mustelus vulgaris, and Squatina angelus; while 



