The whorls are posteriorly gibbose or tumid at the sutures, and the callus is less spreading than in others of the genus.
"Explorations in Australia, The Journals of John McDouall Stuart" by John McDouall Stuart
Behind the neck and immediately above the shoulder rises a gibbosity or hump of the same height as the dorsal ridge.
"Natural History of the Mammalia of India and Ceylon" by Robert A. Sterndale
For my gibbosities tickled the taste of a travelling mountebank.
"The Proud Prince" by Justin Huntly McCarthy