Abstract: Agar-filled petri dishes with covers on them are taken in rows from a first conveyor belt through interface equipment to a horizontal infeed conveyor transporting them in axially aligned packs of ten through a conventional wrapping machine. Two alternate types of interface are used. A "parallel" interface stacks dishes from six columns simultaneously adjacent the end of the first conveyor, to create six stacks of dishes. These are transferred as a group to a lateral conveyor. The lateral conveyor transports the six stacks to a single stack transfer station where a transfer wheel having a horizontal axis receives the stacks and turns them from a vertical attitude to a horizonatal attitude moving in synchronization with the linear motion of the infeed conveyor.