Caug7th or C+7
People always play this one wrong. Caug7 is technically C7#5. Like NTM said, the chord quality is based off the triad (CEG#), the 7th is dominant (Bb). The notes (CEG#B) is Cmaj7#5 and is always documented as such. And for those of you who try to figure out what the interval of a augmented 7th is and add it into the chord, well there's no such thing, an aug.7 interval would just be a repitition of the root.