FRANKFURT (Reuters) - Shares in internet auctioneer eBay <EBAY.O> plunged in Frankfurt floor trade on Thursday, after the company forecast results for the remainder of 2010 below Wall Street expectations.

By 0712 GMT, Frankfurt-listed shares in eBay <EBAY.F> were down 8.1 percent.

"The forecast for eBay fell short of analysts' expectations," a Frankfurt-based trader said.

Qualcomm <QCOM.O>, the world's biggest maker of cellphone chips, also fell 8.6 percent in Frankfurt <QCOM.F>, after forecasting lower-than-expected revenue late on Wednesday.

(Reporting by Christoph Steitz)