1. Introduction to Cilia and Flagella.- 1. Introduction.- 2. Occurrence and Function.- 3. Structure.- 3.1. The Axoneme.- 3.2. The Transition Zone.- 3.3. The Basal Body and Associated Structures.- 3.4. Accessory Structures of the Flagellar Shaft.- 4. Production of Movement.- 4.1. The Sliding Microtubule Model.- 4.2. Active Sliding Is Produced by Dynein Arms Acting on Adjacent Outer Doublet Microtubules.- 4.3. The Mechanism of Force Generation.- 4.4. Internal Resistances Convert Sliding into Bending.- 4.5. Coordination of Interdoublet Sliding.- 4.6. Central Pair Rotation.- 5. Regulation of Movement.- 5.1. Initiation of Motility.- 5.2. Behavioral Responses.- 5.3. Hyperactivation of Sperm.- 6. Sensory Reception.- 7. Origin.- References.- 2. Linkages between Microtubules and Membranes in Cilia and Flagella.- 1. Introduction.- 2. Linkage of Basal Bodies and Transition Regions to the Membrane.- 2.1. Structural Studies.- 2.2. Functions of the Bridges.- 3. Microtubule Capping Structures Attach the Ends of Microtubules to the Membrane.- 3.1. Capping Structures and Motility.- 3.2. Capping Structures and Microtubule Assembly.- 3.3. Caps Are Bound to Assembling and Disassembling Microtubules.- 3.4. Can Capping Structures Regulate Tubulin Addition to Microtubules?.- 3.5. Are Microtubule Caps Found in the Cytoplasm?.- 4. Bridges Linking the Sides of Outer Doublet Microtubules to the Membrane.- 4.1. Bridges Linking Microtubules to Extraciliary Structures.- 4.2. Sites of Attachment of the Bridges.- 4.3. Attachment to the Doublet Microtubules.- 4.4. Sites of Membrane Attachment.- 4.5. Nonciliary Microtubule-Membrane Bridges.- 4.6. Functions of the Bridges.- 5. Summary.- References.- 3. Euglena gracilis: A Model for Flagellar Surface Assembly, with Reference to Other Cells That Bear Flagellar Mastigonemes and Scales.- 1. Introduction.- 2. The Relationship of Euglenoids to Other Organisms.- 3. Flagellar Anatomy.- 3.1. Mastigonemes and the Flagellar Sheath.- 3.2. The Paraxial Rod.- 3.3.l³;