The leaves, which are borne in pairs at the tumid nodes, are oval in form and have a Dicotyledonous type of venation.
Nevertheless, the Nubian type remains essentially negro, being characterized by a very dark complexion, varying from a mahogany brown and deep bronze to an almost black shade, with tumid lips, large black animated eyes, doli-chocephalic head (index 73, 72), hair often woolly or strongly frizzled, and scant beard worn under the chin like the figures of the fugitives (Uaua?) in the battle-pieces sculptured on the walls of the Egyptian temples.
The mouth is at the hinder end of a depression called the buccal cavity, and is surrounded by an annular tumid lip, raised into papilliform ridges and bearing a few spines (fig.
In some species certain of the legs bear on their ventral sides furrows with tumid lips and lined by smooth non-tuberculate epithelium; they are called coxal organs, and it appears that they can be everted.
So high as heaved the tumid hills, so low Down sunk a hollow bottom broad and deep, Capacious bed of waters.