STUDIES ON THE DIGENELIC TREMATODES. 451 
Habitat.—Stomach and intestine of marine fishes. 
Type.— Lebouria idonea n. sp.; including also L. 
obducta n. sp. 
Mention may be made here of another species which bears 
some resemblance to Lebouria idonea, namely, Disto- 
mum alacre Lss.! from Labrus maculatus and other 
Labride. At first sight only comparatively unimportant 
differences are apparent between the two, such as the slightly 
lateral position of the genital aperture, the somewhat elon- 
gated testes and the rather larger ova. The structure of the 
terminal part of the male genital duct, however, is different 
from that not only in Lebouria but also in other ALLOcREA- 
pun#, and for that reason, apparently, Looss has hesitated 
in assigning to this species a systematic position.” 
Genus Podocotyle (Duj.) Odhn., 1904. 
= Sinistroporus Stafford, 1904. 
Podocotyle atomon (Rud.) Pl. 10, fig 28. 
= Distomum vitellosum Linton. Johnstone, ‘ Report 
Lancashire Sea Fisheries,’ for 1906, xxi (1907), pp- 182-185, 
fig. 15. 
For the opportunity of examining these specimens I am 
indebted to my friend Mr. Johnstone, who kindly put them 
at my disposal. Their resemblance to Distomum vitel- 
losum Linton is not borne out on close examination, and 
they have proved to be in reality a species of Podocotyle, 
most probably P. atomon (R.). At first sight I was 
inclined to regard them as distinct from the latter species. 
The unusually cylindrical shape of the body, the excessive 
1* Centralbl. fur Bakter.,’ Ist Abth., xxix, pp. 401-402, fig. 2. 
2 In a paper by Stossich (in ‘ Boll. Soc. Adriat.,’ xxii, p. 211-217), 
which has not yet found its way into the London libraries and which I 
have therefore not had an opportunity of seeing, Distomum alacre 
Lss. is included in the genus Allocreadium (not sens, strict), If 
this species be really a member of the ALLOCREADIIN® it must occupy 
a place very near the genus Lebouria. 
