Devidia II
Devidia II is the second planet in the Devidia system, located in the Marrab sector. Devidia II is the only known location of the cellular fossil LB10445, which was discovered on 24th century Earth but apparently originating from the 19th century. It was later discovered that the planet was inhabited by an intelligent species, the Devidians.
The USS Enterprise-D visited Devidia II in 2368-9 after discovering triolic wave activity on Earth that occurred in the 19th century. (TNG: "Time's Arrow", "Time's Arrow, Part II")
Captain Jean-Luc Picard referred to this mission a few months later, when he remembered the use of a subspace force field on Devidia II. The same technology was needed for the mission to beam on board the Enterprise-D, which was trapped in a temporal fragment. (TNG: "Timescape")