Abstract: An endless tape cartridge having a base and cover includes a reel on the base on which a tape pack is coiled. The reel includes a flange and a hub, and the hub has an upper cylindrical portion which overhangs the tape wound on the reel. A flexible member carried by the cover extends from the periphery of the pack of tape under the overhang to prevent the tape on the reel from riding up on and coning about the upper cylindrical portion of the hub.

Abstract: A tissue culture cluster dish, having a lid which may be removably placed on a base having formed in it a plurality of wells for the placement and growth of tissue cultures; the wells having well bottoms which are transparent and flat for easy viewing of the well contents, the well bottoms being elevated above the plane in which the base makes contact with any horizontal planar surface upon which the base is placed; the base having ribbing which extends below and surrounds the well bottoms, the base further having a base rim of sufficient vertical extend for easy grasping and holding; the lid coming in contact with and being supported by the base only through protrusions upwardly extending from the base, thereby assuring atmospheric communication between the well interiors and the outside of the dish; the lid having ridges to prevent transfer of moisture from the area above one well to that above any other well; and the lid fitting on the base only in one orientation.