...The ribs onone side are taken out with a knife, and the concavity servesas a dish... 
W. E. Webb 「Buffalo Land」
...palatinus in pale color and posterior concavity of theposterior border of the palate...
E. Raymond Hall 「Comments on the Taxonomy and Geographic Distribution of Some North American Rodents」
...The tuberculumand capitulum on each of the trunk ribs are separated onlyby a shallow concavity...
Theodore H. Eaton 「A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas」
...The nasals lack a concavity in the midlateral surface...
Juan R. León 「The Systematics of the Frogs of the Hyla Rubra Group in Middle America」
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