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Description of Folliculina ampullaCell truncate-ovate, average length 5 microns, width 45 microns; when adult, almost filling lower part of lorica; when immature, and therefore smaller, a short anchoring filipode occ1sionally connects the bases of cell and lorica. Collar and flagellum short, projecting into the upper expanded part of lorica. Movements of flagellum languid, never of such a character as to produce definite food-bringing currents. Shape of lorica resembles that of a crown, hence the generic name; sessile. Average total length of lorica: 15 microns, upper portion 9 microns, of lower 6 microns, greatest width of upper portion: 8.5 microns, of lower 5.5 microns. Diameter of mouth of lorica: 4 microns. Number of costae: 16 longitudinal, extending from top to bottom of lorica; 8 transverse, on lower part of lorica.