Ostracoda and Foraminifera of Tidal Rivers. 11 
shelter of which, and often far out into the lake, cage patches 
of water-lily, water-milfoil, and other aquatic weeds. Hickling 
Broad constitutes, however, an exception to this rule, its ve- 
getation consisting to a large extent of a Chara, which is so 
t as to afford occupation to some of the neighbouring 
population in fishing it up and selling it at the rate of nine- 
pence a ton. e broads are uniformly shallow, varying from 
three to fifteen feet in the channels, and (except Hickling, 
which is gravelly) have a bottom of peaty or decaying vege- 
table matter; they are probably in all cases fast filling up. 
Sea-water appears to find access to some of them to a small 
extent at very high tides, about once in six or seven years. 
rom particulars obligingly furnished by Mr. Spencer 
Smyth, we here extract the following :— The level of the 
broads Higham and Hickling seldom varies three inches ; and 
they are not affected by saline particles injurious to fish, ex- 
cept after extreme high tides at Yarmouth—say, eleven feet, 
or two following tides of nearly that height, occurring perhaps 
once in six or seven years: at such times some pike and bream 
are killed in Hickling, but, I believe, not in Horsey or Martham 
Broads, the former only reached by a long, tortuous, and nar- 
row dyke from the upper part of Whittlesea, and Martham by 
an equally difficult although shorter channel from the river 
rtham Broad is fast filling up, choked by reeds, 
with only a sailing channel four feet in depth for small 
wherries to Somerton and Martham. Higham and Hickling 
are also growing up; but the channel has four feet and a half 
till near Hickling, where it falls off to three and a half." This 
extract, though not referring entirely to broads visited by us, 
ver pretty accurately to all, the more remote ones (e. g. 
roxham and Barton), however, being even less affected by 
tides. The information is especially valuable as coming from 
one whose official duties are connected with the survey of the 
navigable river-channels of the district. 
z. Lake Lothing is a tidal expanse separated from Oulton 
Broad, at its western extremity, by an embankment, through 
which canal-boats pass by means of a lock. In this way some 
slight communication exists between the waters of the two 
basins; but the true outlet of Oulton Broad is by the river 
Waveney, which from this point takes a circuitous course of 
