440 G. M. R. Levinsen. 



outwards and placed, as a rule, on a level with the first third of 

 the membranous area. 



In a colony from St. 63 a fairly large number of zooecia have 

 the frontal area more or less filled by a somewhat convex calcareous 

 film, perforated by an oval opening of different size, while in other 

 zooecia the central portion of the film is occupied by an avicularian 

 beak. We have, therefore, no doubt to do with a regeneration, by 

 which an avicularium has been formed within an old zooecium. A 

 number of regenerated zooecia has also been found. 



A number of colonies from Stat. 63, Stormbugt, 20—40 m. 



Stat. 68, off Cape Bismarck, 40—60 m. 



Stat. 71, off Cape Bismarck, 30—40 m. 



Stat. 72, Stormbugt, 30 m. 



Membranipora (Callopora) lineata L. 



Flustra lineata Fabricius, Fauna Groenl., p. 137. 

 Eschara — Fabricius, Manusk. Hefte 3, Nr. 384. 

 Membranipora lineata 2, forma lineata Smitt, op. cit. 1867, pp. 364 

 and 390, Tab. XX, fig. 23. 



— — Hincks, British Marine Polyzoa, p. 143, pi. 19, 



figs. 3—6. 



— — Levinsen, Mosdyr, Zoologia Danica, 4 В, 1. Afd., 



p. 60, tab. 5, figs. 4—6. 



— — Osburn, op. cit. p. 228, pi. 23, figs. 31— 31 с 



I have not been able to find independent avicularia in any of 

 the colonies of this species which I have hitherto examined. 



A rather small number of colonies mostly on hydroids, on the 

 stems and branches of which they form narrow cylindrical incru- 

 stations. 



Stat. 62, Stormbugt, 10—20 m. 



Stat. 66, Stormbugt, 30—40 m. 



Stat. 67, Danmarks Havn, 20—30 m. 



Stat. 68, off Cape Bismarck, 40—60 m. 



Membranipora (Callopora) arctica d'Orb. 



Reptoflustrina arctica d'Orbigny, Paléontologie Française Terr. Cret., 



T. 5, Bryozoaires, p. ô82. 

 Membranipora Sophiae Busk, Zoophytologie, Quart. Journ. Micr. Se, 



vol. 3, p. 255, pi. 1, fig. 7. 

 — lineata, forma Sophiae Smitt, op. cit. 1867, pp. 365 



and 394, pi. 20, figs. 24, 25. 



