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water, which emptied itself lower down into the main stream. 
The bed was pebbly, while true water cresses, Nasturtium, 
officinale, and other water plants abounded, and which afforded 
excellent cover for quantities of water shrimps. Here I 
obtained numerous fresh water limpets, Ancylus, water-snails, 
Limnea peregra var. ovata, while leeches, Piscicola geometra 
were very common under the stones, as well as examples of 
Planaria lactea and P. torva. Glossiphonia secoculata* was by 
no means rare under large pebbles while in May eggs were 
present on their abdominal surfaces. On turning over the 
stones in the stream I found a nest of the bull-head, the eggs 
being in a large mass, and of a salmon colour, they merely 
touched one another at their sides, consequently a space was 
left for water to circulate. I netted the male alongside the 
nest. A berried cray fish Astacus fluviatilis was likewise cap- 
tured. What will be the fate of these little fry time only can 
show. 
® Tam indebted to Professor G. Bell, of the British Museum, for kindly 
determining some of these invertebrate forms. 
