I’m looking at my favorite bus line maps thanks to the http://www.ratp.fr website. Most bus stops accommodate several bus lines. Just take a look at the <<Les Écoles>> stop listing 5 lines. When you duck under the stop enclosure, you’ll see maps for each of the lines. Les Écoles stop includes line 21 which I’m using here for show-n-tell.
All bus lines indicate their two terminal points (similar to the Metro lines). Each stop along the route is indicated by a straight line and the street/stop name listed above it as shown below.
So far so good? Bon. Allons-y!