Just some additional information
The 1st and 2nd Lincolshire Rifle Volunteer Corps became volunteer battalions of The Lincolnshire Regiment in 1881 without change of title.
In 1883 they became 1st and 2nd Volunteer Battailon, The Lincolnshire Regiment.
In 1900 3rd Volunteer Battalion, The Lincolnshire Regiment was raised.
In 1908 these three battalions were reorganised in 4th and 5th Battalion, The Lincolnshire Regiment (TF).
The whole is here in chart form:
Infantry Volunteers: Lincolnshire.