Sentence:  The posterio-lateral socket ridge lies between the socket and the <WSD>interarea</WSD> (pl. 2, figs. 9b, 13b, 16b). The posterio-lateral socket ridges are accommodated by grooves in the hinge teeth of concavo-convex species or pockets between the hinge teeth and the <WSD>interarea</WSD> of resupinate species. 
Meaning of the word marked with <WSD> tags:  A typically triangular shelf of shell on some brachiopods that serves as a weight-bearing surface to stabilize the valves.