Not sure what you already have.
Assisted passages to NSW, aboard
Forest Monarch, arriving 21 December 1858, sailed from Plymouth or Portsmouth
John GARRICK, 23, labourer, Native Place: Muckart?, Perthshire
Janet GARRICK, 23, wife, Native Place: Tullacoultre?, Clockmanningshire?
Christina GARRICK, 10 months, died on voyage.
Both can read and write, both religion listed as Pres. Both have same parents listed

- John and Margaret, living in Clockmanningshire? for one of them; the other lists the place as Cloughmanningshire?
The index transcribes them as
Origin Location: Clormell, County Tipperary, Ireland
A slightly different list gives the same info but his origin is definitely Perthshire and hers looks like: Clackmannan?
The NSW Quarantine Station site gives this information:
1858 The "Forest Monarch" quarantined with 341 emigrants from Southampton. Dr Crane was surgeon superintendent, T.R. Anderson was commander, A.MacFie - first mate, D.Yeates - Mason.
http://www.manlyquarantine.com/History_1837.htmShipping mention on TROVE
http://trove.nla.gov.au/ndp/del/article/13014732Edit to add - I think the origin is Scotland as I see this address on Googlemap.
Muckhart, Clackmannanshire
Judith