292 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Labroid fish (Labrus merula) taken in the Bay of Trieste, 

 and D. various has various hosts, the latest description 

 being that of Odhner, who found the Trematode in a 

 dab (Pleuronectes limanda) from the West Coast of 

 Sweden. Odhner's specimens resemble those described 

 here in that the vitellaria are rounded and regular in 

 outline instead of being slightly mulberry-shaped as in 

 Looss's species. This is the only significant difference 

 apparent between the two species. 



III.— PEOTOZOA. 



Ichthyophthirius multifiliis, Fouquet. 



Trichodina, sp. 



In June, 1906, Inspector Halsall of the Southport 

 Sanitary Department sent some roach which had been 

 living in Hesketh Lake, Southport. Some little time 

 previously an epidemic had broken out among the fishes 

 in this pond. Only the roach were affected, and pike, 

 perch and eels living in the same water showed no signs 

 of disease. The epidemic produced considerable 



mortality among the roach for about a month, but by 

 the end of July it had run its course, and there were then 

 thousands of young fishes in the lake, all of which 

 appeared to be quite healthy. The fish, when received 

 at the laboratory showed no apparent outward signs of 

 illness. The skin was bright and clean and without 

 traces of fungus. Dissection showed no internal lesions, 

 and smears made from the blood and various organs 



* Looss : b. Einige Distomen der Labriden des Triesten Hafens, 

 Centralbl. f. Bakteriologie, Bd. 29, Abth. 1, p. 437, 1901. 



f Odhner : Die Trematoden des Arktischen Gebietes ; Inaugural 

 Dissertation Univ. Upsala ; Jena, 1905. 



