Ted Thompson, Executive Vice President, General Manager and Director of Football Operations, announced the signings Monday.
Bishop, a 6-foot-2, 241-pound player from California, was selected 192nd overall. A first-team All-Pac 10 selection in 2006, he became the first Cal player in 13 years to lead the conference in tackles.
Crosby, a 6-foot-1, 212-pound player from Colorado, was chosen 193rd overall. A three-time All-Big 12 selection, he established a total of 31 game, season and career records at Colorado.
The team now has signed seven of its 11 draft selections.