Culture dish

A culture dish, comprising

• an axisymmetric receptacle having an axis, an external lateral face, an upper rim and a bottom on which is disposed a layer of culture medium,
• a movable lid covering the receptacle and having an upper part, an internal lateral face, and an internal face from which projects a spreader,
• means to transfer the lid from a depositing position to a spreading position and to an opening position,
• said means including a peripheral rib on the external lateral face of the receptacle and interrupted by at least two notches angularly distributed in a regular manner and, associated respectively with each notch, a lowering stud emerging from the internal lateral face of the lid, at a distance from the upper part of the lid which is greater than the distance between the upper rim of the receptacle and the rib, said rib, notches and lowering studs being arranged to transfer the lid from the depositing position in which the spreader is spaced from the layer to a spreading position in which the spreader touches the layer in a manner such that the transfer requires at least a first movement and a second movement, in different directions, with respect to the receptacle, to be imparted to the lid,
• said means also including, associated respectively with each notch, a raising stud emerging from the internal lateral face of the lid, said raising stud being further away than the lowering stud associated with the same notch from the upper part of the lid by a distance at least equal to the dimension, along the axis of the receptacle, of the rib, said rib, notches and raising studs being arranged to transfer said lid from the depositing position to the opening position in which the lid can be removed in a manner such that the transfer requires at least a first movement and a second movement, in different directions, with respect to the receptacle, to be imparted to the lid.