F. W. Flattely 281 
The disease seems prevalent in flocks which are singularly free from ecto¬ 
parasites. 
The invertebrates which seem most likely to harbour an intermediate stage 
are coprophagous insects, etc. (beetles, flies, mites). Attempts to infect species 
of Aphodius have nevertheless proved fruitless. 
Moisture favours the survival of the eggs of Moniezia : eggs kept in water 
for a period of several months seemed to remain perfectly viable. Nevertheless 
tapeworm is common among flocks on pastures about Rome which are charac¬ 
teristically dry. 
A comprehensive series of experiments under conditions of the most 
complete control would almost certainly clear up the life-history; on economic 
grounds alone the problem is urgent. 
The overwhelming majority of a quantity of worms collected from slaughter¬ 
houses in Aberystwyth, Aberdeen, Beauly (Inverness-shire) and Newcastle- 
on-Tyne proved to be of the species M. expansa. The only other species found 
were M. trigonophora and M. alba. The identification was based on anatomical 
characters and not on externals, which are useless. 
The writer intends directing his attention to coprophagous mites as carriers, 
viz. Gamasus coleoptratorum, G. fimetorum ,, Macrocheles glaber. 
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