A COMPARISON OF ZOOPLANKTON SAMPLING METHODS IN THE CALCOFI TIME SERIES

A button snap flap closure for a pocket having a flap which overlaps a surface of the pocket. The closure comprises an elongated keeper secured to the pocket, the keeper having a ridge comprised of ribs in parallel relationship formed therein and a clip having a top portion secured to the flap. The clip is comprised of depending walls adapted to engage the ribs of the keeper.