eggs with thin shells

[Smoke Me A Kipper I'll Be Back For Brekky <P.L.Unger@bolton.ac.uk>]

hello dinosaur ppl

in reference to phillip bigelow's point about shell thickness - "2 mm 
thick shells on a 16' long egg is a bit thin" (or words to that effect)
- is it possible that the young dinosaur could gestate inside a shell
inside the mother's body - so the mother would lay the egg a short time
before the  egg was due to hatch.

no nest would be needed to protect the egg - mother could lay a brood of
40-50 and protect them while they hatched - the shell, although thin,
would protect the foetus from damage incurred during mother's fights
while it was gestating in her body

apologies if this sounds like a silly question - i'm just an interested
layman who has more interest than knowledge    :)

would someone please tell me what a troodon is ?

@uggi