with Report on Experiments. 
363 
is, doubtless, often overlooked bj being mistaken for the pre- 
ceding species. 
4. Strongylus rufescens (Leuckart). — This entozoon is readily 
recognised by its remarkable size. The females measure six 
or seven inches in length, the males being about an inch 
shorter. The latter have a much divided or lobed hood, the 
form of the spicules being likewise very peculiar (Alois Koch). 
Fig. 1. — Tail of tlie Male Lung-ivorm of Cattle, showing the Hood, tlte 
Bays, and the Spicules. Magnified 375 diameters. 
This parasite is sometimes associated with the Strongylus 
Jilaria in the sheep. It is probably as abundant in England as 
on the Continent, where, as remarked by Krabbe, it " not 
unfrequently occasions inflammation of the lungs with more 
or less obliteration of the finest bronchial tubes." 
5. Pseudalius pulmonalis (Alois Koch). — Though little known 
to English agriculturists, this small parasite is perhaps the 
2 B 2 
