Abstract: A dart or other dropped object having a shearable sleeve member is dropped or launched down hole, typically during cementing operations, until it lands on a seat within a dart catcher receptacle. By increasing a pressure differential across the landed dart to a predetermined amount, the shearable sleeve member shears from the dart. The dart extrudes through the still-seated stationary sleeve member and passes to a ported catcher sub. A first alternative embodiment utilizes a novel collet member as a seat in a dart catcher receptacle, while a second alternative embodiment utilizes a resilient flexible seat member.