...3, elbow bending southeast; on its concave northern side appeared the settlement Vinda la Nzádi... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...The spines are flat onthe under-surface and concave on the upper, sharply pointed andbroadest near the root...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Nostrils concave, near half the length of the bill, covered by a membrane, opening by a long slit midway between the gape and tip...
William Swainson 「Zoological Illustrations, Volume I」
...The lower mandible half the depth of the upper, the sides concave, and the teeth less...
William Swainson 「Zoological Illustrations, Volume I」
...Anterior wings trigonal, the hinder dentated, generally tailed, with an obtuse concave lobe at their anal angle, which is generally in motion when the insect is at rest...
William Swainson 「Zoological Illustrations, Volume II」
...The upper line of the billshould be slightly dished or concave...
Harry M. Lamon 「Ducks and Geese」
...Theflight is rapid and accompanied by astartling whirr, caused by the quickstrokes of their small, concave, stiff-featheredwings...
Various 「Birds Illustrated by Color Photography [August, 1897]」
...Now he flieslevel, with broad expanded wings nearly as roundand as concave as two shells, which beat theair slowly...
John Burroughs 「Bird Stories from Burroughs」
...Cymbiform: boat-shaped: a concave disc with elevatedmargin; navicular...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Fornicate: arched or vaulted: concave within, convexwithout...
John. B. Smith 「Explanation of Terms Used in Entomology」
...One side,forming the bottom of the cell, is concave, being beaten down andsmoothed off by the bee...
Alpheus Spring Packard 「Our Common Insects」
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