Abstract
In previous papers (Millar, 1952; 1954a; 1954*0 I have dealt with the re-productive cycle of several ascidians in Scottish waters, and in the present account observations are extended to other species.The course of breeding was studied in the following species. Family Polyclinidae:Sidnyum turbinatum Savigny, Aplidium nordmanni (Milne Edwards), A.punctum (Giard), A.pallidum (Verrill) and Polyclinum aurantium Milne Edwards. Family Didemnidae:Didemnum candidum Savigny and Lissoclinum argyllense Millar. Family Clavelinidae: Clavelina lepadiformis (Müller).

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