VICTORELLA — BANTA 



another through veiy short tubules that originate from the basal- 

 lateral wall of the zoecium. In the more peripheral portions of the 

 colony the tubules are considerably longer and the zoecia are wider 

 apart (fig. 2). 



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200)1 



Figures 1-4. — Victorella argilla: 1, three zoecia from the center of a form A colony; 2, 

 developing zooids and anastomosing tubules from the periphery of a form A colony; 

 3, tangential section at the junction of the cardium and caecum of a form A zooid (see 

 fig. 7: sph.) (abbreviations: cae = caecum, car = cardium, rer = reinforced region, 

 sph = sphincter); 4, surface of a form B colony, one polypide extruded. 



Intercalary tubules are interrupted by a thick septum with a 

 heavily reinforced annulus and a small central pore. There is only 

 one septum per tubule; the tubules are therefore not kenozoecia and 

 do not represent true stolons in the sense of Silen (1944, p. 29). 



