NO. 8 FORAMINIFERA FROM HADLEY HARBOR COMPLEX BUZAS 9 
species, but also their relative abundance, and summarizes this infor- 
mation as a single number. It behaves, as the field observer intuitively 
would, by giving more “weight” to those species which are most 
abundant and much less to species which are rare. 
The function was calculated for the living and total populations at 
the two sampling times. The results are shown in figures 3 and 4. The 
top number at each station is for the living population and the bottom 
for the total. At those stations at which replicates were taken the two 
sets are shown. 
The values of the information function for the paired samples which 
are shown in figure 4 indicate that the function can be estimated 
fairly well from a single sample. The variation usually is less than .7, 
except for stations 265, 266, and 270, where the number of Foraminif- 
era is very low. 
The April 1964 sampling time has, in general, higher diversity values 
than the July 1964 sampling time. The number of individuals was 
considerably greater in April 1965 (see table 1). Because the infor- 
mation function is calculated only from proportions it can be independ- 
ent of density. However, the number of species observed is often a 
function of the number of individuals examined (see Preston, 1962) 
and so in samples with very many individuals the addition of the ‘rare’ 
species increases the value of the function. Although higher diversities 
were recorded in April 1965, the pattern of distribution of the indices 
is similar for both sampling times. The highest diversity occurs in the 
outer harbor (stations 96 and 259) . Diversities are also relatively high 
in the gutters. The area of lowest diversity is in the inner harbor, 
especially northwest of Goats Neck, where values of 0 (1 species) or 
no values (no Foraminifera) occur. 
The values of H(S) in the Hadley Harbor Complex are similar to 
those calculated for Long Island Sound, Buzzards Bay, and Cape Cod 
where values of less than 2 are the rule. Values of H(S) calculated 
from Parker’s (1948) open-ocean data in the surrounding area are 
usually over 2. 
RELATIONSHIP OF FAUNA TO ENVIRONMENTAL 
SUBAREAS 
No apparent simple relationship between the distribution of fora- 
mini feral species and the environmental subareas outlined previously 
was found. That is, no simple assemblage characteristic of outer 
harbor, inner harbor, and gutter subareas can be defined. The only 
clearly discernible pattern is that most of the gutters and outer harbor 
