east of the transepts, and the presbytery and high altar occupied their relative positions as in the older plan. Behind the screen or reredos of the high altar a bay was screened off as a feretory or shrine for the local saint. At this point the high roof of the church ceased, and the roof of the eastward extension was on a level with that of the aisles, which were thus returned to afford a processional path at the back of the feretory. On the east side of the processional path were chapels enclosed by screens, while a long aisleless Lady chapel was built out from the centre of the east wall. At Chester the eastern chapel, which contained St Werburgh's shrine, is directly at the back of the high altar, and no space was left for a processional path: this was remedied to some extent in the fifteenth century by prolonging the north aisle eastwards and so affording a lateral entrance to the chapel. In the east and north of England, as at Ely and Selby, it was customary to continue the high roof to the extreme east end of the church, and to prolong the aisles to the same length on either side, so that externally the ambulatory and eastern chapels are not definitely expressed. In such cases a row of altars, divided by screens or perpeyn walls, stood side by side against the east wall. These alternative plans were not peculiar to the religious orders, and the second plan was freely used in the larger Yorkshire churches, by secular canons at York and Ripon, by Benedictines at Selby, Whitby and St Mary's, York, by Cistercians at Jervaulx and Rievaulx, and by Augustinian canons at Guisbrough and Kirkham. [Illustration: Fig. 2. Croyland abbey: rood-screen and nave from S.E.]