CYCLOSTOMATOUS BEYOZOA— CANU AND BASSLEE 



59 



understand the mode of attachment and how the colony is able to 

 retain its equilibrium. The tubes are cylindrical, with dorsal gem- 

 mation. The fascicles are hi- or triserial. The ovicell is always 

 placed on an exterior flabelliform subcolony in the neighborhood of 

 the margin of growth. The zoarial pentagons figured by D'Orbigny 

 are exaggerated; in reality the central subcolonies are irregularly 

 orbicular. 



Occurrence. — Lower Cretaceous (Valangian) : Sainte-Croix (Vaud), 

 Switzerland. 



Plesiotyx)es.— Cat. No. 69907, U.S.N.M. 



Fia. 2Q.—RadiofascigeTa ramosa D'Orbigny, 1853. A. Longitudinal section, X 16. The tubes are thick- 

 ened at their extremity. B. Transverse section, X 16. Lower Cretaceous (Valangian): Sainte-Croix, 

 Switzerland 



Genus RADIOFASCIGERA D'Orbigny, 1853 



1853. Radiofascigera D'Orbignv, Pal^ontologie francaise, Terrain Cr6tac6, vol 

 5, p. 691. 



Theonoidae of subcylindrical branches formed of numerous con- 

 fluent colonies of Actinopora. 



Genotype. — Radiofascigera ramosa D'Orbigny, 1853. Cretaceous. 



