MR. W. G. CLARKE ON BRECKLAND CHARACTERISTICS. 57I 
that in this inland locality were found insects whose normal 
habitat was the coast sand-hills from which they rarely 
wandered even for a hundred yards, the only thing to 
differentiate the “ breck ” specimens from those of the coast 
being their emergence a few weeks earlier, and in some cases, 
their brighter colours. Yet though coast insects are com- 
paratively numerous, only seven species of coast-plants have 
been recorded, though one of these, the sand-sedge (Carex 
arenaria) — locally known as “ net-rein ” from its matted 
roots — is in places extremely abundant. As rabbits eat grass 
and not sand-sedge, where rabbits abound the latter has the 
best chance of increasing. Almost all these sand-dune plants 
have been found within a short distance of the alluvium by 
the courses of the present streams, and on a geological map it 
will be seen that most of these streams were at one time 
probably salt-water creeks from the fen basin. On the south 
bank of the river Lark the sea timothy grass (Phleum aren- 
ariunt) has been found on Cavenham Heath, and 
Corynephorous canescens on Lackford Heath, while Carex 
arenaria occurs on Tuddenham, Cavenham and Lackford 
Heaths close to the marshland. It is also found on Icklingham 
Plains on the north bank of the river Lark, and on West Stow 
Heath where it grows in the greatest profusion, particularly 
between the road and the river. It furthermore occurs on all 
the heaths within a radius of three miles of Mildenhall. inter- 
mixed here and there with Ph. arenariutn. On Culford Heath, 
which is about two miles distant from a patch of Lark valley 
alluvium atWordwell, C. canescens and Ph. arenariutn have been 
found and on Troston Heath a short distance from the stream 
which flows from Ampton Water into the Lark. Ph. arenariutn 
and C. arenaria have been recorded. A narrow strip of fenland 
even now extends to Eriswell and this is the nearest alluvium 
to Weather Heath, some three miles distant, on which 
C. arenaria has been noted. Lakenheath Warren formed part 
of the eastern shore of the sea which covered the fen, and here 
C. arenaria, Corynephorous canescens and Festuca ambigua 
have been recorded, while another bay of the fen bordered the 
adjoining Wangford Warren, where C. arenaria is abundant. 
On heaths on the southern slope of the Little Ouse valley we 
