I'm sorry but statlib cannot (yet) send you the full collection of the
crab datasets.  You will have to manually ask for each dataset.  A
message to statlib@temper.stat.cmu.edu, with the body of the message
containing the lines.

 send catch from crab
 send celsius from crab
 send eggs from crab
 send dstns from crab
 send fleet from crab
 send fullness from crab
 send kodiak from crab
 send notice from crab
 send salinity from crab
 send survey from crab

will send you all of the datasets.
Before you do this, please make sure you have obtained the README file
for the crab dataset (i.e.)
 send README from crab

-- The Statlib administration