a cover disposed over said membrane and sealingly engaged with said body to accommodate axial sliding movement from an outer position to an inwardly displaced position, said {TAIL ~ cover} defining a dispensing orifice and defining an edge for severing at least part of {HEAD ~ said membrane} as said cover is non rotatably moved from said outer position to said inwardly displaced position, said cover and said body together defining a chamber over said membrane 
a cover disposed over said membrane and sealingly engaged with said body to accommodate axial sliding movement from an outer position to an inwardly displaced position , said { TAIL ~ cover } defining a dispensing orifice and defining an edge for severing at least part of { HEAD ~ said membrane } as said cover is non rotatably moved from said outer position to said inwardly displaced position , said cover and said body together defining a chamber over said membrane
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