IN THE NORFOLK BROADS DISTRICT. 
73 
TABLE 5 . SHOWING NUMBER OF SI’ECIES PER COLLECTION 
IN EACH DISTRICT. 
Name of District. 
Ant. j 
6 
'A 
3 
u 
y 
Pali. 1 no. 
Coast. 
Ormesby. 
& h 
V *1 
D Z 
*— • 
04 
D 
No. of Collections 
in each district. 
236 
179 
217 
<0 
00 
70 
119 
12.38 
I2 -35 
1 1.26 
9.96 
12.93 
9.11 
1 1.44 
But here again the result must be taken with caution, 
for by reference to the map it will be seen that the Ormesby 
district, which shows 12.93 species per collection, is represented 
by a single station, while no other district, except the Muck 
Fleet, has less than four stations. The collecting places 
within the Ormesby district are all contained within say 
half a square mile, while a much greater area is covered in 
all the other districts, and there would, therefore, probably 
be more similarity between the collecting places at Ormesby 
than elsewhere, which would account for the greater similarity 
in the Beetle fauna. This explanation will, however, only 
account for the probably false position of the Ormesby 
district, and it will be noticed that in both the tables the 
Coast and the Muck Fleet districts are at the bottom of the 
list, indicating poverty both in species and in distribution 
of the species within the districts. This cannot be due to 
the salinity of the water, because the water is slightly salt 
in some of the Palling stations and some of the Hickling 
stations, but I believe that it is due to one cause on the Coast 
and to another in the Muck Fleet district. I think that the 
exposure of the Coast district is probably the cause of its 
poverty, while in the Muck Fleet district the poverty is 
probably due to the changing salinity of the water. I have 
found here at one time a salinity of 235 grains per gallon, 
