suborner (suborner)

[ A thin plate-like sub - ostracal or (so-called) dorsal cartilage, the anterior end of which rests on and fits into the concave nuchal cartilage. Encyc. Brit., XVI. 675. Subostracea (sub-os-trā sē-a), n. pl. [NL. (De Blainville), II. n. A member of the Subostracea .