Epididymis: the convoluted efferent ducts, massed at the posterior part of the testes.
Epigastrium: the first entire ventral sclerite of the abdomen.
Epigenesis: the doctrine of growth from an undifferentiated germ, as opposed to preformation, which implies development from already existing rudiments.
Epigenetic: the period after the union of the male and female elements, during which organs are forming.
Epiglossa: = epipharynx; q.v.
Epiglottis: = epipharynx; q.v.
Epilabrum: a sclerite at each side of the labrum: specifically applied in myriapods.
Epilobe: of mentum in Carabidae, really corresponds to a partially divided ligula: a lateral appendage of a bilobed mentum.
Epimera -eron: the posterior lateral thoracic sclerites; usually small, narrow or triangular.
Epiopticon: the second ganglionic swelling of the optic tract: see opticon.