9. galeam. This belonged to Pluto, the god of the underworld of the dead,
and whosoever wore it was invisible. The story is that Perseus compelled
the Graeae to tell him how to obtain the helps to his enterprise by
seizing their tooth and eye.

11. pedibus, 'on his feet,' dative of indirect object.

induit. See the note on 3, 13.

aera. _Aer_ is borrowed from Greek, and keeps this Greek form for its
accusative.

12. volabat. Distinguish between _volo, volare_, and _volo, velle_.

13. ceteris. _Ceteri_ is used to denote all not already named ('the
other'), while _alii_ denotes some of those who have not been already
named ('other').

14. specie horribili, 'of terrible appearance.' ablative of description.
A noun never stands alone in this construction,

earum. See the note on 3, 22.

15. contecta. This and factae below are used as predicate adjectives, not
to form the pluperfect passive with erant. Translate, therefore, 'were
covered.' not 'had been covered.'

18. vertebantur. The imperfect here denotes customary action, one of its
regular uses.