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(Originally described under the name Glaucoma pyriformis)  Ventral view.  Key to Schewiakoff's abbreviations:  a -- Anus cv -- Contractile vacuole el -- Ectoplasm l.or -- Left edge of mouth m -- Undulating membrane mi -- Inner Undulating membrane N -- Macronucleus ncl -- Micronucleus nv -- Food vacuole oe -- Throat r.or -- Right edge of mouth