I don't think they get more veins either, but if they have veins they should be fertile and with proper care will probably hatch.
The OP would have to have a very warm room to not need an incubator. As The Hedgehog said corn snake eggs should be kept at around 82 degrees.
"They can incubate at anywhere from 76-86 degrees F. 80-84 is an ideal range as too hot or too cold can sometimes cause the hatchlings to develop problems in development." - http://www.reptilespecialists.com/ca...ornsnakes.html