Assertion: lamprey's eye | /r/HasProperty | covered by skin
Facets:
value: always
type: TEMPORAL
Source sentences:
text: The third eye, where present, is always much smaller than the main paired eyes, and, in living species, it is always covered by skin, and is usually not readily visible externally.
text: Caecilians have ring-shaped folds of skin called annuli, small eyes covered by skin and sometimes bone, and a pair of tentacles.