Trilobite Eggs. Credit: Glendon Mellow

Trilobite eggs. Just how much do we know? Were they little ellipses kept in a brood pouch on their cephalon? Did some trilobites lay their eggs with clumps of eggs from other species of trilobites -or even other organisms- like cuckoo birds? There were so many species of trilobite and they lived so long ago, I'd like to think that I can wonder. 

Further (and more realistic) reading: