Plate, microscopic views of hydatid by unknown artist Four drawings showing microscopic views of a hydatid. Subject: Anatomy / Entomology Published in Philosophical Transactions as 'Lumbricus hydropicus; or An essay to prove that hydatides often met with in morbid animal bodies, are a species of worms, or imperfect animals. By that learned and curious Anatomist Edward Tyson, M. D. and R. Soc. S'. Read to the Royal Society on 22 February 1687. [1687]