16 THE NAUTILUS. 
It flows for a distance through meadow land in a valley ; here mol- 
lusca are seldom found. The next portion continues through a val- 
ley thickly wooded, with alders overhanging the water and covering 
the narrow belt of marsh; beyond these the steep banks and upper 
land are covered with pine growth. Land shells occur rarely along 
this area: Succinea ovalis, Patula striatella, Strobilops labyrinthica, 
Zonites exiguus ete., have been found here. The brook has a fine 
lot of Margaritana margaritifera of large size and fine specimens. 
Pisidium variabile, abditum and adamsii occur in the mud, the last 
of these in an area of a few feet, but having some fine examples. 
Planorbis and Physa also occur sparingly. The third area is a mile 
or two of tide marsh ; here one may study the problem of salt and 
freshwater distribution. The writer gave an afternoon to this work 
a few days ago with the following result: [n the upper quarter of 
the marsh Pisidiwm occurs more or less abundantly, and Amnicola 
is to be found in great profusion ; following the windings careful 
siftings were made. Pisidiwm disappeared after the first quarter of 
the distance to the sea; I am quite sure that salt water has little or 
no influence here. Amnicola was met with where Pisidium had 
disappeared, but only for a short distance. The portion following 
this in the second quarter was entirely wanting in shells, but grad- 
ually salt water forms showed themselves, i. e., Macoma and Litorina. 
The marsh itself now gives an interesting field of study. Plant life 
is very rich, but that is not our subject. Pot holes now reveal the 
presence of multitudes of Litorinella minuta living on the thread- 
like marine plants. The Goose Fair Brook enters the sea in the 
middle of a long beach, generally known as Old Orchard beach. 
Its marine shells are chiefly Litorina littoria and Macoma, the latter 
often badly eroded. I have seen living specimens with the animal 
exposed in places where erosion had destroyed the shell. Not far 
from the shore there must be beds containing Te/lina tenera, Cero- 
nia arctata and others, as specimens are washed up by storms. I 
trust that these few observations may help to settle the question of 
the distribution of marine and freshwater forms. At any rate this 
is one point in the evidence. 
SOME NEW OR RARE SPECIES OF MARINE MOLLUSCA RECENTLY 
FOUND IN BRITISH COLUMBIA. 
The following note may be of interest to collectors of West Coast. 
Mollusca. It adds sixteen species to our fauna not hitherto reported 
