Captus Networks announced on Wednesday it received a $16.1 million second round from St. Paul Venture Capital and GMS Capital Partners, which co-lead the round. Other investors included Celerity Partners and individual investors. The Woodland, Calif.-based company designs and markets network security devices to guard against denial of service attacks and distributed denial of service attacks. With its latest round, the company has raised a total of $19.6 million. See complete list.