34 



divided by distinct ridges, of wliich the two distal ones may often be more or less cur- 

 ved. The tubercles are either lacking or very feebly developed. The more or less 

 strongly protruding, half-elliptical aperture which at the utmost takes up the half 

 breadth in the distal part of the zooecium is a little longer than broad and about 

 as long as the concave or saddle-shaped suboral area which rises obliquely to- 

 wards the aperture. In well preserved zooecia there may be found a narrow oral 

 ledge. 



The operculum is radially striated, and its pores seem to be perforations of 

 small rounded elevations. 



The Helerozooecia which are present in rather scarce numbers are of very diffe. 

 rent size, the smaller of them being onlj' as long as the zooecia while the larger 

 may attain more than the double length of the latter. While the former have an 

 elongate triangularly rounded aperture, the length of which is contained 3—2 times 

 in the length of the whole heterozooecium the latter have an elongate ligulate aper- 

 ture, which is longer than the suboral area. Dislally to the triangular opening is 

 seen a longitudinal depression, bordered by two marginal thickenings. 



Ooecia have not been found. 



Kenozooecia of the same form and size as the zooecia are found in most frag- 

 ments, generally in groups of 2 — 10. 



The Closure takes place by means of a concave lamina. 



The Regeneration. There is not rarely found a regeneration of new zooecia in 

 old ones, and when the new aperture is not sharply divided from the old, its pre- 

 sence may be inferred from that it is much smaller and much more protruding 

 than the other. Another form of regeneration which is perhaps more frequent is 

 that the aperture of an old zooecium is filled by a small heterozooecium, the roun- 

 dedly triangular aperture of which is as a rule obliquely protruding, and I think 

 that Marsson statement: „Die Zellen besitzen an der Spilze oft auch ein kleines, 

 zuweilen von einer Pore durchbortes Warzchen" must be referred to this form of 

 regeneration. In a few cases I have seen a zooecium regenerated in a large hetero- 

 zooecium (fig. 14) and a new large heterozooecium in an old one (fig. 15). 



The Colonies are incomposite, and the cylindrical branches have c. 10 zooecia 

 in each transverse row. 



Numerous specimens have been found in the chalk (upper Senonian) from 

 Moen (Denmark) and from Tullstorp (Sweden). 



Meliceritites Filiozati n. sp. 



Clausimultelea tuberculata d'Orbigny, Hryoz. cret. p. 656, pi. 784, figs. 12—15, 



(PI. VI, figs. 7—10.) 



The Zooecia which are in most cases twice as long as broad and more or less 

 regularly rhombic, are divided by well-developed marginal ridges, and the suboral 

 area is as a rule a little convex. No tubercles. The half-elliptical aperture, the 



