On inquiring their use, we learnt they were intended as a species of saddle-cloth for the pack ponies, to protect the Vertebrae.
"A Girl's Ride in Iceland"
Ethel Brilliana Alec-Tweedie
The spine is, in fact, a long narrow causeway made of large stones, set like the Vertebrae of some huge animal.
"See America First"
Orville O. Hiestand
There is also a peculiarity about his Vertebrae.
"The Boy Hunters"
Captain Mayne Reid