Wendy Houvenaghel claimed her second medal in Melbourne as Great Britain finished runners-up in the women's team pursuit at the track World Cup event.
Houvenaghel, who won the individual pursuit on Thursday, teamed up with Katie Colclough and Joanna Rowsell to finish second to New Zealand.
In the men's sprint Matt Crampton beat Ross Edgar to take the bronze medal.
After two legs Australia lead the World Cup standings with 210 points, 11 ahead of second-placed Britain.
GB dominated the opening leg in Manchester but sent a small squad to the second event of the series.
606: DEBATEThe most successful rider on Saturday was Australia's Anna Meares, who won the keirin and 500m time trial as the hosts claimed eight of the 17 events during the three-day competition.
Meares, who won the 500m time trial in 33.583 seconds, the second-fastest time in history, claimed three gold medals in total following her earlier victory in the sprint.
"I was really quite worried about the load this evening and once the 500 (time trial) was out the way, I really didn't get the chance to celebrate, I was straight into the mindset of the keirin," Meares said.
"I was tired, I was hurting, but I actually felt half decent."
Perkins, riding for the Australian Jayco professional team, beat Frenchman Kevin Sireau two heats to nil to take out the men's sprint.
The third World Cup leg will be staged in Cali, Colombia, from 10-12 December.
RELATED INTERNET LINKS:
Melbourne World Cup 2009 results
International Cycling Union
British Cycling
Cycling on the BBC
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