44.8 WILLIAM NICOLL. 
spectively in the intestine and the stomach. The description of 
both is extremely scanty and hardly admits of positive identi- 
fication. D.incisum, it is true, was regarded as identical 
with D. fellis Olsson by Stossich, but this is denied by 
Jacoby.’ It is almost certain that neither species is identical 
with Lebouria idonea. Distomum atomum Rud. is 
noted by von Linstow? under Anarrhichas lupus, but in 
the reference® it is only recorded from Platessa flesus. 
The peculiar condition of the ova which von Linstow describes 
distinguishes his specimens from Podocotyle atomon 
(Rud.), and renders it not at all improbable that they were 
really specimens of Lebouriaidonea. ‘The first mention of 
this actual species is by Miss Lebour,* who has kindly allowed 
me to describe it in consideration of a previous communication 
of its discovery which I had made. It is not the only species 
which occurs frequently in the intestine of Anarrhichas 
lupus, for in invariable association with it, but usually in the 
lower parts of the intestine, I have met the much smaller form 
Zoogonus rubellus (Olsson). This is the first record of 
the latter species from the cat-fish, and also the first time 
it has been met with in British waters, yet it is a constant 
parasite of the cat-fish in this locality. 
It remains to differentiate Lebouria idonea from already 
recognised members of the sub-family ALLocREADIINE. From 
Podocotyle (Duj.) it is easily distinguished by the median 
position of the genital aperture; from Helicometra Odhner 
by the non-filamented condition of the ova, and from Allo- 
creadium Lss. sens. str., by the oblique position of the testes, 
the backward situation of the ventral sucker, and the absence 
of distinct pars prostatica. Amongst the unclassified forms 
it appears to bear most resemblance to Distomum tumi- 
dulum Rnud.,° but that species is more elongated, has a 
1 * Arch. f. Naturg.,’ lxvi, p. 13. 
2 *Compend. d. Helminth. Nachtrag.,’ p. 82. 
8 «Arch. f. Naturg.,’ xliv, p. 225. 
* ‘Northumberland Sea Fisheries Report for 1907, p. 16. 
> Odhner, “ Revision einiger Arten der Distomumgattung Allocrea- 
dium Lss.,” in ‘ Zool. Jahrb. Syst.’ xiv, pp. 503-505. 
