This is off of their first album, back when they were just "Dinosaur". The Jr was added after they started to become popular due to the threat of a lawsuit.
The first album isn't their best, but I absolutely love this 7". The B-side wasn't originally released anywhere else (though it now leads off the Merge 2005 re-issue of the first album), and it was worth owning this just for that. It's got all of the early Dino Jr elements, Lou's screaming background vocals, a great line, "I want to crumble, but instead I sit", and a noisy guitar solo. I'd forgotten all about this song, and I think I've listened to it about 8 times tonight.
B: Bulbs of Passion