Hi Barry
This is my favourite link for Oz cemeteries but only one in victoria so far. They are referenced on the site mentioned by terra
http://cemindex.arkangles.com/. (This is probably the same one that you mentioned finding)
I found a couple more children - apologies if you already have them
Didn't find William's birth but I found a death in NSW records
William Stopps infant 1847 ref V18471449 32B melb St James C of E
Baptism George Stopps Father Jesse mother Jane Sth Yarra 1849 ref 16544 St james Melb C of E
Baptism James
Stops 1845 ref 14047 same parents and church
Baptism Lewis
Stops 1847 ref 15348 same parents and church
Baptism Rebecca Stopps 1852 ref 17626 same parents and church
Trish
Edit: Some early Victorian bdms are also on the NSW site - until Victoria separated from NSW, I think. The church records are held in many libraries and research centres in Australia if you wish to check them.
I don't know if this is yours
James Stopps married Annie Sullivan 1869 ref 1328 (one of them listed born Melbourne)
There are also some children born to James and Annie Sullivan if relevant