$ file schizosaccharomyces_pombe.chr.gff3
schizosaccharomyces_pombe.chr.gff3: gzip compressed data, from Unix, last modified: Thu Oct 20 13:14:13 2016
$ mv schizosaccharomyces_pombe.chr.gff3 schizosaccharomyces_pombe.chr.gff3.gz
SunTzu:Downloads$ gunzip schizosaccharomyces_pombe.chr.gff3.gz
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PomBase files appear to be corrupt. In my haste I tried unzip instead of gunzip. @Michael has directions for what you need to do.As an alternate: Ensembl also has the Pombe gff files.
Thank you! Both of these solutions worked.