SEA-FISHERIES LABORATORY 



275 



differences are perhaps to be attributed to the action of 

 the preservative. The hooks .are large and very notice- 

 able. They are not bifurcated, but lie in pairs with their 

 broad bases in close contact. One is only slightly curved, 

 but the other is strongly bent. Delicate focussing shews 

 that these structures are hollow. 

 Anthobothrium musteli, van Beneden.* 



From Mustelus vulgaris, Llandudno Bay, 1906. 



About six specimens of a cestode which appears to be 

 the above species were found in the large intestine of a 

 small Mustelus. The characters differ slightly from those 



Fig. 12. Anthobothrium musteli. Scolex. 



4G dia. 



given by van Beneden, so I add a description and figure. 

 The measurements of the worm are : — 



Length of longest strobila (incomplete) : 32 mm. 



Diameter of scolex : 1*3 mm. 



Diameter of a bothrium : 1*3 mm. 



Diameter of auxiliary sucker: 0T mm. 



Length of a free proglottis : G mm. 



Breadth of a free proglottis : 2*5 mm. 



* Vers Cestoides, p. 126, pi. 7. 



