Skull short and massive, with beak rounded and stout. Carina of sternum
aborted. Limb-bones short and very stout, the ulna being shorter than the
humerus, and having very prominent tubercles for the secondaries; cnemial
crest of tibia greatly developed. No foramen between third and fourth
trochleae of tarso-metatarsus. Spines of dorsal vertebrae tall. The power
of flight was absent. The chief differences from _Cereopsis_ were the
presence of extra pre-sacral vertebrae, so that two only instead of three
ribs articulate with the sacrum; and an elevated pent-roof arrangement of
the _ossa innominata_, which indicate more decided cursorial habits.