Lidi

Hollow Earth Fauna: The Lidi - Creatures used as mounts and beasts of burden by the tribe of Thuria in the Pellucidar books by Edgar Rice Burroughs. 

"In this way they were like unto thipdars, in that to the hairless lidi."

"We had barely entered the great plain when we discovered two enormous animals approaching us from a great distance. So far were they that we could not distinguish what manner of beasts they might be, but as they came closer, I saw that they were enormous quadrupeds, eighty or a hundred feet long, with tiny heads perched at the top of very long necks. Their heads must have been quite forty feet from the ground. The beasts moved very slowly—that is their action was slow—but their strides covered such a great distance that in reality they traveled considerably faster than a man walks.

As they drew still nearer we discovered that upon the back of each sat a human being. Then Dian knew what they were, though she never before had seen one.

"They are lidis from the land of the Thorians," she cried. "Thoria lies at the outer verge of the Land of Awful Shadow. The Thorians alone of all the races of Pellucidar ride the lidi, for nowhere else than beside the dark country are they found."

"The Thurians do domesticate the colossal lidi, traversing the great Lidi Plains upon the backs of these grotesque and stupendous monsters, and possibly there may also be other, far-distant peoples within the great world, who have tamed others of the wild things of jungle, plain or mountain."

" Inside I could see the heads of women and children peering over the top of the wall; and also, farther back, the long necks of lidi, topped by their tiny heads. Lidi, by the way, is both the singular and plural form of the noun that describes the huge beasts of burden of the Thurians. They are enormous quadrupeds, eighty or a hundred feet long, with very small heads perched at the top of very long, slender necks. Their heads are quite forty feet from the ground. Their gait is slow and deliberate, but so enormous are their strides that, as a matter of fact, they cover the ground quite rapidly."