I looked and couldn’t find gurshaws either, maybe we both had the name wrong. Could it be Crenshaw melons we remember?
http://www.heirloomseeds.com/melons.htm
http://www.neseed.com/Crenshaw_Melon_Seed_s/256.htm
No, not a melon, this was definitely a squash. Had a round body and a long neck. Green/pale green stripes. I’m going to ask some of the Amish around here, this summer. They may still grow it.