296
THE ESSEX NATURALIST
Soil Analysis
Table III shows the results of the mechanical analysis of the
soil samples taken at the given stations. The last column shows
that there has been a gain in weight in every sample. Theoretic-
ally there should be a loss in weight of about 5% due to various
causes. These causes, and possible reasons for the gain in weight
of up to 5% will be discussed, along with a detailed description of
the, methods of analysis, in another paper.
TABLE III
DISTRIBUTION OF THE MACROFAUNA OF THE CREEK
The species included in this account are only those which are
retained in a 30 mesh brass sieve; no account has been taken of
the microfauna of the creek.
List of Species
ANNELIDA—Polychaeta—Nereis diversicolor (Muller)
Arenicola marina CL.)
Sabellidae (tubes)
MOLLUSCA— Lamellibranchia—Cardium edule (L.)
Mytilus edulis (L.)
Scrobicularia plana (da Costa)
—Gastropoda—Littorina littorea (L.)
Paludestrina stagnalis (L.)
ARTHROPODA—Crustacea— Cirripedia—Balanus balanoides (L.)
Elminius modestus (Darwin)
Amphipoda—Corophium arenarium (Crawford)
Corophium volutator (Pallas)
Decapoda—Carcinus maenas CL.)