Lemuel may be a bit of a problem as the name gets mistranscribed a lot. On the 1851 census the first letter in his name is the same as the first letter of Llanigon. The enumerator's S is different.
Just spotted his baptism in Llanigon 14 March 1784 son of Lemuel & Ann and yes, transcribed as Samuel!
red post - Llanigon is missing from 1861 as mentioned earlier.
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb