Hi Jill
Only just discovered this thread, from a Google search. I am also researching the Morrisons of Monimail and although I do not have Janet and James in 1841 I have them in 1851. Two years is a long time so you're probably already got the information but just in case!
The family is living in Cupar, Fife (Parish No. 420) at Toll House Carslogie
Alexander Morrison son b 1834 Monimail Linen Weaver
James Morrison head b 1790 Falkland Tea Dealer Weaver
James Morrison son-in-law b 1816 Monimail Gardener
Janet Morrison wife b 1790 Monimail
Alexander Robertson adopted son b 1839 Falkland scholar
Regards
Ruby