Longbodied Cellar Spider

Also called a Daddy Long Legs Spider. Often confused with a non-spider Daddy Long Legs. (See below this paragraph). in a spider web near the junction of the ceiling and a wall in the building I live in. This one was in a web in a dark section of the hall with very little lighting. I've seen these spiders before in this building. The fact that he was in a web eliminated his being a non-spider Daddy Long Legs (of the order Opiliones).I'm pretty sure I'm correct on nameing this one. If I'm wrong, please correct me.