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FiQ. 2r>.—Plelhoporena ramuiosa D'Orbigny, 1853. A. Longitudinal section, X 8, in a zoarium containing a partially envelop 

 tag subcolony, the initial tube of which is at r. B. Portion of fig. A, X 16. C. Part of longitudinal section, X 16, througt 

 a tuberosity where the tubes are broader. D. Portion of a transverse section X 16. E. Tangential section, X 16, show. 

 ing the larger tubes of the tuberosities and the other smaller tubes. Upper Cretaceous (Maastrichtian): Royan, France 



