According to death registrations in Victoria, Isabella's maiden name was 
HIRST.
1841 Census HO107/1274/127
Living at Meltham Mills, Yorkshire  - All born County
SCHOLES John  35  Clothier  
SCHOLES Isabella  35 
SCHOLES Thomas  15  Silk Dyer
SCHOLES John  15  Cotton Carder
SCHOLES William  11  Silk thrower
SCHOLES Richard  9 SCHOLES Isabella 7
SCHOLES Mary 5
SCHOLES Martha 2
SCHOLES Sarah 1
1851 Census HO107/2295/356/54
Living at Cross Church Street, Huddersfield
SCHOLES Richard  19  
Butcher  Born Hillhouse, Huddersfield
The Bendigo Advertiser  25 Nov 1859
Richard Scholes, 
butcher, of Carisbrook, said that on the election day, at Carisbrook, about four o'clock, he had seen Mr. Major's cart standing opposite the Town Hall. Witness was standing with Mr. H. N. Simson, who observed that the owner of the horse deserved to be horsewhipped.
Deaths of Richard’s siblings in Victoria
SCHOLES John Denton
Father John Denton   Mother Isabella HIRST
1863   37 years  Born England  Reg#6008
SCHOLES William Henry
Father Jno Denton Mother Isabella HIRST
1883  Death place unknown 54 years  Reg#12138
Many 
SCHOLES burials at
http://www.bencemtrust.com.au/search.aspSCHOLES Ada Rosina
Death  29 Dec 1931 
Bendigo cemetery headstones 1836-1986 (part)
Genealogical Society of Victoria. Bendigo Group.   Page#570
SCHOLES Arthur. 
Death 11 Jun 1934
Bendigo cemetery headstones 1836-1986 (part)
Genealogical Society of Victoria Bendigo Group  Page#570
SCHOLES  Ethel Mary
Death   24 Oct 1959 
Bendigo cemetery headstones 1836-1986 (part)
Genealogical Society of Victoria Bendigo Group  Page#570
SCHOLES James Richard. 
Death  8 May 1963
Bendigo cemetery headstones 1836-1986 (part)
Genealogical Society of Victoria Bendigo Group Page#570
Richard and Harriet have Wills and probate files on
http://prov.vic.gov.au/index_search?searchid=54These are digitised however you need to be patient when downloading.  Very slow website.
Cando