33 



distal margin, but while the smaller of them are nearly circular apart from the 

 straight proximal margin the larger of them are more or less ligulate with almost 

 parallel or proximally somewhat converging lateral margins. While those hetero- 

 zooecia that are provided with the smaller apertures like the zooecia have an an- 

 gularly bent distal end, the distal end of the others corresponds to a smaller or 

 larger distal part of the ligulate aperture. The larger part of the aperture is fdled 

 by a concave lamina which no doubt corresponds to the oral ledge in the zooecial 

 aperture, but in most cases this lamina has been expanded by a more or less ad- 

 vanced closure, and there is only left a fissure-like or narrow triangular opening. 

 Sometimes the whole aperture is filled, and only in a few cases there has been 

 found a half-elliptical or semi-circular opening (fig. 19). 



The Kenozooecia which have the same form and size as the zooecia are as a 

 rule found together with a number of heterozooecia, but they are not so frequent 

 as the latter. 



The Closure is effected by means of a concave lamina but it is much more 

 common in the heterozooecia than in the zooecia. 



The Regeneration. A regeneration of new zooecia in old ones is not frequent, 

 but in most fragments there is found a number of old zooecia the aperture of 

 which have been filled by heterozooecia with a small aperture (fig. 19). 



The Colonies are uni-layered, and the cylindrical branches bear alternate trans- 

 verse rows of c. 15 zooecia. 



I have found numerous specimens in the chalk from TuUstorp (upper Senonian) 

 Sweden. 



When Gregory refers, v. Hagenow's and Roemer's descriptions of Mel. Roemeri 

 to Mel. gracilis Marss. he relies upon the authority of Marsson, who, however, is 

 wrong in his supposition. In Hagenow's figure of the former species the length 

 of the aperture is contained about thrice in the length of the zooecium, and that 

 is just the case in most exemplars of Mel. propinqva, while in Mel. gracilis Marss. 

 the aperture is as long as or even longer than the suboral area. But also the very 

 short and incomplete descriptions agree with Mel. propinqva and not with Mel. gra- 

 cilis. V. Hagenow designates the apertures as „Kreisrunden oder abgerundet drei- 

 eckigen .... Poren", but these terms cannot in any way be used about the elongate 

 distally somewhat pointed apertures of Mel. gracilis, and when both authors speak 

 about zooecia in which the aperture is only represented by a fine pore, they 

 evidently speak about the heterozooecia. Such a heterozooecium is seen in 

 Hagenow's figure. 



Meliceritites sqvaniala Marsson. 



Marsson, Bryozoen Riigen p. 47, pi. IV, fig. 9. 

 (pi. V, figs. 13-17.) 



The Zooecia which at the utmost may be half a lime longer than broad are 

 in most cases as broad as long and even a little broader. They are hexagonal and 



1). K. 1). Vklensk. Si-lsk SUi-., 7 It.-eUI.e. n;iluiviili!nsU. or m.nlhem. M\\. X. 1. c- 



