288 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



During the same day we caught one brill about 

 11 inches in length, and the intestine of this fish on being 

 opened was also found to contain one eestode, which was 

 preserved for identification, and is here ascribed to the 

 above species. It was attached to the wall of a pyloric 

 caecum. The head was buried in a little pit, round which 

 the wall of the intestine was raised to form a prominent 

 papilla. Text-fig. 6 is a view of the head seen 

 obliquely from above, and shows one of the bothria. The 

 dimensions of the worm are as follows.: — 



Length of head ... ... ... 1*2 mm. 



Greatest breadth of head . . . 0'32 mm. 



Length of a posterior proglottis 0*22 mm. 



Breadth ,, ,, ,, 4"0 mm. 



Length of the worm ... ... 180 mm. 



Dibothrium functatus is very Avidely distributed. 

 Diesing has enumerated 11 species of European fishes as 

 its hosts, including Cottus, Scorjrius, Gadus, Trigla, 

 Rhombus, and Pleuronectes. Linton* records it from 

 several species of American pleuronectids. Its size 

 appears to be very variable. Drummond records a 

 specimen from the brill which was 3 feet in length, but in 

 the turbot the usual length, according to this author, was 

 8 to 18 inches. The specimen recorded here was 8 inches 

 long, but the above measurements were made on the worm 

 after death and subsequent preservation in formalin. 



Tetrarhynchus tetrabothrius, van Beneden (PL III., fig. 12). 

 (From the pike-dogfish.) 

 Five specimens of Acanthias vulgaris, the pike-dog- 

 fish, dissected at Piel by Mr. Scott, all had one or more 

 specimens of a tetrarhynchid in the small intestines 

 immediately behind the pylorus. These worms I am 

 referring doubtfully to Tetrarhynchus tetrabothrius, van 

 * Bull. U. S. Fish Comm. for 1887, p. 731. 



