The vaulting is lierne vaulting, with short ribs, which connect the main ribs together.
"Bell's Cathedrals: The Cathedral Church of Gloucester [2nd ed.]" by H. J. L. J. Massé
The lierned stone vault, with its heavy, angular ribs, is of a very unusual kind.
"Bell's Cathedrals: The Cathedral Church of Wells" by Percy Dearmer
Vaulting with intermediate ribs, ridge ribs, and late in the style lierne ribs, and bosses.
"Architecture" by Thomas Roger Smith