- Ecto-endodermal ocelli
- Ecto-endodermal statocyst
- Ectoderm
- Ectodermal statocyst
- Ectoplasm
- Ectoplasmic cortex
- elongate
- Embryonic shell
- endite
- endochondral
- Endoderm
- Endoplasm
- Endopod
- endopodite
- Endoral membrane
- endostyle
- Enp
- enterocoelous
- Entocodon
- Entoderm
- Envenomation
- Epaulette
- Ephyra
- epibiont
- Epidermis
- epimeral plate
- epipelagic
- Epipod
- epipodial appendage
- Epipodial tentacle
- epipodite
- Epipodium
- epistome
- epithelium
- epitoke
- Equatorial plane
- estuary
- ethmoids
- Eucephalic lobe
- eudoxid
- euhaline
- Euhedral crystals
- Eversible proboscis
- evolution
- Excretory papillae
- Excretory pore
- Exopod
- exopodite
- Exp
- Extracapsular cytoplasm
- Extracapsulum
- Extraumbilical aperture
- Extrusome
- Exumbrella
- Exumbrellar cnidocyst cluster
- Exumbrellar spur
- Exumbrellar wart
- Eye