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Sea Urchin Sequence Data (Nucleotide)
via GenoBase at the NIH

Click on the genome collection you wish to inspect...
For example if you click on the Strongylocentrotus purpuratus listing, you will get an index with two entries that looks like this:
    LPACTAS to 

That means that there are so many sequences available (257 in January 1996) that they have created two pages to list them. Click on either to get to the sequences.