The egg envelopes of Polymorphus minutus (Acanthocephala).

@article{Whitfield1973TheEE,
  title={The egg envelopes of Polymorphus minutus (Acanthocephala).},
  author={Phil J Whitfield},
  journal={Parasitology},
  year={1973},
  volume={66 3},
  pages={387-403}
}