I have several Ginkgo Bilboa seeds. They have been in a wet paper towel in the fridge (in a ziploc of course lol) - I have been waiting to plant them, due to temperatures & weather here (zone 9, sacramento, ca)

I check the seeds often, to make sure they are not drying out, etc. I noticed the other night, that several of the seeds are splitting open along their rib.......

What does this mean? Are they sprouting? Did I do something wrong? What do I do?!