Medusan vessel rendezvous with Enterprise.
A Medusan vessel is a type of starships that functioned under the authority of the Medusans.
In 2268, the USS Enterprise conveyed the Medusans' ambassador to the Federation, Kollos, along with Miranda Jones, to a rendezvous with a Medusan vessel following an unspecified diplomatic mission, and a short diversion through the galactic barrier.
In preparation of boarding the Medusan vessel, Jones had committed herself to mind-link with Kollos once the two had reached the Medusan vessel, which was in turn bound for the Medusan homeworld. (TOS: "Is There in Truth No Beauty?")
Background
The inclusion of this Medusan vessel, which unseen in the original airing of this episode, is based on an reference made by Jones in her dialog with Spock. While not included in the original version of this episode, this addition was included in the 2008 remastered version of the episode, replacing the Medusan homeworld that was included the original version of the episode.
Based on information obtained from Mike Okuda, no name or registry number was specifically assigned to this ship. In terms of its design, Mr. Okuda added, "the basic idea was Dave Rossi's suggestion. He thought that because the Medusans were non-corporeal and might not have developed technology as we know it, they might use Federation hardware, so their ships could have a distinct Federation style."