Above is a round-headed window with a slightly smaller arch on each side, with cushion capitals.
"The Cathedral Church of Peterborough" by W.D. Sweeting
At the height of the springing of the arch the shafts are surmounted by plain cushion capitals.
"Bell's Cathedrals: The Cathedral Church of Durham" by J. E. Bygate
All the attached shafts in all three stages have cushion capitals.
"Bell's Cathedrals: The Cathedral Church of Ely" by W. D. Sweeting
Their capitals represent the type known as the 'Pseudo-Ionic' or cushion capital, in view of its broad head.
"Byzantine Churches in Constantinople" by Alexander Van Millingen
The term "cushion" is given in architecture to the sides of the Ionic capital.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8" by Various