156 



P. J. van Beneden in diag-nosing 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. 18) are closely apposed and one seems to fit into the 



\[\n Hi' 



Fig. 18. 



Acauthobothrniin coruiuituiii, van Ben. Srolex mag. 22 

 di;i.. linoks map;. '200 rlia. 



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

 apparently no fusion of the substance of these structures. 



Calliobothrium verticillatum, Rudolphi.— Figs. 14. 



Host : Galeus vu/gar/s, Cardigan Bay. 



P. J. van Beneden recorded this species from Galeus 

 cauis, Mustelus vulgaris, and Squatitia angelus; while 



