32 



Ooecia have not been found. 



Kenozooecia of the same form and size as the zooecia are often found together 

 with the heterozooecia in a number of 1—3. 



The Closure takes place by means of a concave lamina. 



The Regeneration. Besides a regeneration of new zooecia in old ones there is 

 found very commonly a regeneration of heterozooecia in zooecia. 



The Colonies are incomposite, and the examined cylindrical fragments contain 

 10 — 12 zooecia in each transverse series. 



Numerous specimens from the chalk (upper Senonian) of Tullslorp (Sweden). 



Melicerilites Roemeri v. Hagenow. 



Ceriopora Roemeri v. Hagenow, Monogr. d. Rugensclicn Kreidc-Verst. (N. Jahrb. 1. Mineral 1839, p. 



285, pi. V, figs. 7a— b. 

 Melieeritites (Ceriopora) Roemeri Roemer, Verst. nordd. Kreidegeb. 1841, p. 18. 



Vaginopora Roemeri v. Hagenow, Geinitz Grundr. d. Versteinerungskunde, 1846, p. (i02, pi. XXlllb. fig. 20. 

 non Ceriopora velata v. Hagenow, Monog. Riig. Kreide-Verst. (N. .lalirb. f. Mineral.) p. 285, pi. V, fig. (i. 



Nodelea propiuqva Marsson, Bryozoen Riigen, p. 47, pi V, fig. 1. 

 non Melieeritites gracilis Marsson, Bryozoen Riigen, p. 46, pi. IV, fig. 8. 



(pi. V, figs. 18—24.) 



The Zooecia which are in most cases only half as long as broad are 

 hexagonal and divided from each other by a meshwork of distinct ridges in the 

 knots of which there is found more or less developed often prismatic tubercles. 

 The half-elliptical aperture which may be a little longer than broad and does not 

 take up the whole breadth of the zooecium in its distal part is as a rule much 

 shorter than the concave suboral area. It is provided with a well-developed peri- 

 slomial thickening, and in especially well preserved zooecia there is seen a distinct, 

 but rather narrow oral ledge. All the specimens examined have lost their opercula. 



The Heterozooecia. There is found two different forms of heterozooecia the 

 larger of which is avicularia-like and provided with a long narrow aperture. They 

 are present in very scarce number, and in most of the fragments examined there 

 has been found only a single one, rarely two or three. They are always larger 

 than the zooecia, and the longest of them have a length a little more than twice 

 that of the zooecia. The aperture which is longer than the suboral area and three 

 or four times as long as the breadth in tlieir middle part is provided with a me- 

 dian dei)ression bordered by two narrow lateral thickenings. The other form of 

 heterozooecia is found in large numbers among the zooecia, rarely singly, but as 

 a rule in groups of 2 — 10, in most cases mixed with a number of kenozooecia. 

 They have the same form and size as the zooecia from which Ihey differ in the 

 form of the apertures which, however, is subject to great variation. The same is 

 the case also with their size as their length may be contained five to two and a 

 half times in the length of the zooecium. In opposition to the zooecial apertures 

 they have a narrow, feebly developed, perislomial thickening and a broadly rounded 



