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reddish brown. These spiders are very abundant in the Spartina region. 
A short search will reveal a number of them running up and down the 
Spartina blades or resting head downward on them. 
As the tide comes in, they retreat up the Spartina grass. When 
the tide has once chased them out on the isolated blades of Spartnia (6 to 
S inches from the tip), they retreat te within about two inches of the tip 
where they remain head downward until the water almost touches them. 
Then they begin to run wildly up and down the blade, from tip to water, 
from water to tip, as if they were very much afraid of the water. After 
doing this a number of times they will calmly walk down the blade under 
the surface of the water until they come to the pit formed by the union 
of the stem and the blade. Here they remain until the tide retreats. 
The pit furnishes them protection from aquatic enemies and supplies them 
with air, for there is always a considerable amount of air left in the pit. 
That this reaction is due to an effort to secure protection and air, was 
shown in several experiments. When they were placed on blades of grass 
weighted to the bottom of the jar which was slowly filled with water, they 
went down the blades and attempted to crawl under objects at the bottom 
of the jar. However, to get under some object did not satisfy them, they 
kept on moving until they came to a bubble of air. Their actions were 
especially interesting when safety pins were used to weight down the 
blades. They would walk entirely around the wire part of the pin until 
they came to the sheath where there was a quantity of air. Into this they 
crawled. They always cling tightly to the wire, never attempting to leave 
it. It is however not essential for them to find a bubble of air. I kept 
a number of them submerged for three days without any noticeable bubbles 
being present. When they go below the surface, they always entangle 
numerous small air bubbles in their short, dense hairs, which are curved 
backward seemingly for this special purpose. I performed many experi- 
ments to compare the resistance of this spider to drowning with that of 
other species by submerging them in water. In my experiments I used 
practically all species found farther back on the marsh; Tetragnatha, 
Lycosa, Epeira, Attidie, Themsidse. This was the only species, with the 
exception of the young Clubonia, which could be submerged in water when 
resting on a grass blade; i.e., the other species did not hold fast, but tried 
to escape on the surface of the water. The most striking difference between 
these spiders when they were placed in small vials whose mouths were 
covered with cheesecloth and then submerged in a large glass jar of sea 
