BARBADOS-ANTIGUA EXPEDITION 75 
free transportation; and in one ease. Podochela gracilipes, a 
living hydroid (Sertularella) was found on the immensely 
elongated leg of a very slender crab dredged from a depth of 
about thirty-five fathoms. A specimen of hermit crab, probably 
Eupagurus, had ensconced itself in a large Livona shell, upon 
which were five living anemones, and a Mithrax bore on its 
rostrum a large bunch of green seaweed. A habit often shown 
by sea anemones had been adopted by a Mithrax which had fas- 
tened on its back a number of broken bits of shells, thus protect- 
ing itself from observation. It came from sandy bottom at a 
depth of twenty fathoms. Another crab, (Pitho mirabilis) had 
a very light colored surface exactly simulating. sand. Prac- 
tically all of the large genera Pinnotheres and Mithrax are 
protectively colored, and they are also much given to bearing 
sponges on their backs to conceal them from their enemies. 
A very large crab, Mithrax pilosus, was taken from the sea- 
wall at Pelican Island. It had a spread of nearly a foot. The 
carapace bore many large curved spines, particularly along its 
edges. The legs ended in strong curved claws and were spiny 
except on the terminal part of the chele. The body was nearly 
covered with bristle-like tufts of fine hairs greatly resembling 
the paxille on many star-fish. The eyes were very small, dark 
colored and sunken into pits where they were difficult to see. 
As noted before, certain species of crabs lived a semi-symbiotie 
life near the bases of very large anemones. One, Mithrax 
coryphe, was exceedingly hairy and the carapace was broadly 
triangular. It is so covered with hair and tag-like tufts as to 
be very inconspicuous. We had ample evidence that this crab 
was often captured and devoured by the anemone. Another 
with similar habits in Macroceloma subparallelum, with two 
horn-like projections or rostral: spines just above and between 
the orbits. Miss Van Wagenen kept a number of these anemones 
alive for a considerable time and witnessed their successful 
capture of the crabs which became entangled with the adhesive 
tentacles of the anemone. She also found fragments of these 
crabs in the stomachs of their hosts. Here we have an associa- 
tion between very different animals quite similar to that which 
I deseribed in the Bahama report, page 121, in which a little 
fish obtains protection by living among nematocyst-laden ten- 
