482 WILLIAM NICOLL. 
very numerous, measuring *023-025 by ‘010-013 mm. 
Habitat, Larus argentatus. 
Genus, Levinseniella Stiles, 1902. 
The species of this genus, namely L. brachysoma (Crepl.), 
L. pellucida Jigersk., and L. propinqua Jagersk., have 
been efficiently described by Jagerskidld.t he species 
which I] have described under the name Spelotrema 
feriatum n. sp.2 must be considered as a mixture of two or 
more of the above mentioned species or of some hitherto 
undescribed species of the same genus. I found the species 
originally in Hematopus ostralegus, and was struck with 
its resemblance to Distomum brachysomum Crepl., but 
was led astray by Villot’s transposed representation’ of 
Creplin’s species. Jagerskidld’s elucidation of the true 
structure of that species has enabled me to identify my 
specimens as Levinseniella brachysoma or some nearly 
related species. 
At the time cf describing the species “Spelotrema 
feriatum,”’ I entertained great doubt as to the actual 
identity of my specimens from Vanellus and Hematopus 
with those from Pelidna and Algialitis. This doubt has 
now given place almost to a certainty that they are distinctly 
different, for the former, although quite as large as the latter, 
were in every case decidedly immature and pale in colour, 
while the latter contained numerous ova and were of a more 
or less brownish colour. According to Jiigerskiold, He ma- 
topus harbours a species distinct from that inhabiting 
A gialitis, Totanus and Pelidna. his would appear 
to solve the difficulty with regard to my specimens, but 
unfortunately I cannot entirely reconcile my own observa- 
tions with Jagerskiéld’s descriptions. For instance, the brown 
pigmentation of the body and the intensely black mapping 
1 Zur Kenntniss der Trematodengattung Levinseniella,’ in ‘ Zool. 
Studien tillignade,’ Prof. T. Tullberg, 1907, pp. 185-154. 
2* Annals and Mag. Nat. Hist.,’ (7), xx, pp. 251-253. 
3 «Ann. d. Sciences Nat.,’ (6), viii (1879), pp. 22-24, pl. v, fig. 7. 
