An update on:
"Feb 23, 2009
Further observation: The crays have hatched but still cling onto the mother in their curled up position. From what I see, they can't walk yet. I found 3 that fell off the mother. Two are still alive and in the ball position as shown above. Another one isn't curled up but is unfortunately not showing any movement, I assume it's dead.
The two survivors are both isolated in a little plastic container inside the tank to protect them from the adults. They're wiggling around still, hopefully they'll start walking around soon "
One of the two babies that fell off when they were unable to walk yet passed away. However, the first egg that I found DID start walking last night. It fell off the mother 5 days prematurely and was isolated through a plastic container inside the tank ever since. It still grew at the same pace as his/her brothers and sisters.
So for future reference, if your crayfish eggs have hatched and fall off the mother, scoop them up gently and keep them in a safe place inside the tank. There is a possibility that it will grow further and begin walking!