The Yridian vessel was a shuttlecraft-sized vessel utilized by the Yridians during the 2360s.
Such a vessel was capable of traveling at warp speeds, and performing planetary landings. This vessel had two seats in the front of the craft, and an area to rest in the back, along with a rear entry hatch. (TNG: "Birthright, Part I")
The trader Jaglom Shrek owned such a vessel in 2369, which he used during his various excursions. (TNG: "Birthright, Part I", "Birthright, Part II")
This ship was referred to twice in dialogue as simply a "vessel", though according to script notes, this was more specifically "Shrek's shuttlecraft", and the shuttle's interior was a "Redress of Enterprise shuttle."
For more information on the studio model, please see TNG studio models.