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Quarterly Journal of Microscopical Science, Vol s2-85, 153-176, Copyright © 1945 by Company of Biologists

Memoirs: Formation and Nature of the Opercular Chaetae of Sabellaria alveolata

F. J. EBLING M.Sc.1

1 Department of Zoology, University of Bristol

1. The structure of the operculum of Sabellaria alveolata L. is described. There are three fans of chaetae set in each opercular lobe.

2. The chaetae are formed in two longitudinal sacs on each side; the outer one supplying the outer fan, and the inner the two remaining fans. There is a continual movement of chaetae from the sacs into the dorsal ends of the fans; they move round the fans and eventually drop out at the ventral ends.

3. The chaetae are secreted by a continuous band of cells moving round the posterior end of the sac and forwards along its ventral side. The nature of the striations at the base of the forming chaeta is discussed.

4. Around this primary core secreted by the basal cell, other cells of the sac secrete a secondary layer.

5. The structure of the fully formed chaeta is described and its two layers correlated with those observed in process of formation.

6. The chaetae are shown to be composed of protein and not chitin. The materials of the outer and inner layers appear to have different iso-electric points.






© The Company of Biologists Ltd 1945