478 WILLIAM NICOLL. 



been recorded from British waters, and it is the only occasion on which 

 it has been met with in this host. 



Sub-Family Lepocreadiinae. 

 Genus LEPIDAPEDON Stafford. 

 Lepidapedon rachion (Cobbold). 

 Odhner, 1905, pp. 332-7 {Lepodora rachiaea). 

 Lebour, 1908, pp. 29-30. 

 This was found frequently in the intestine of the pollack {Gadus 

 follachius) once in considerable numbers. It was not met with in any 

 of the other Gadoids, of which nearly 40 were examined. 



Lepidauchen stenostoma Nicoll. 

 Nicoll, 1913a, pp. 240-1. 

 Two specimens were obtained from the intestine of Lahrus berggylta. 

 This species has already been fully described. 



Genus PHAEYNGORA Lebour. 



Pharyngora bacillaris (]\Iolin). 



Nicoll, 1910, pp. 341-7. 



This parasite was met with very frequently in the intestine of Scomber 



scombncs, Gadus merlangus, Capros aper and Cydopterus lumpus. Only 



one specimen of the last-mentioned fish was examined (22nd April, 1910), 



and it contained several thousand immature specimens ranging in length 



from -6 mm. to 1-8 mm. I have previously recorded the occurrence of 



this parasite in the lumpsucker caught in St. Andrews Bay (1909, p. 22, 



Distomum sp.). In that case, too, the parasites were all immature, 



though very much fewer in number. In Capros aper, also, although I 



have found the parasite in moderate numbers on four occasions, they 



have always been immature. Only in the mackerel and whiting have 



fully mature specimens been obtained. The mackerel is undoubtedly 



the commonest host of this parasite. 



Family FELLODISTOMIDAE. 



Sub-Family Fellodistominae. 



Genus STERINGOTREMA Odhner. 



Steringotrema cluthense (Nicoll). 



Nicoll, 1909, pp. 472-5. 



This species was the commonest member of the family Fellodistomidae 



