35 



length of which is very often contained twice in the length of the suboral area is 

 provided with a distinct but rather narrow oral ledge, and together with the nar- 

 row peristomial thickening very often takes up the whole breadth in the distal 

 part of the zooecium. The convex operculum which has been lost in most zooecia 

 presents a distinct flabelliform striation. 



The Heterozooecia which are spread singly among the zooecia in rather scarce 

 number are as long as or even longer than the zooecia. The aperture which in 

 most cases is a little longer than the convex suboral area, is about half as 

 long as broad, and the two allmost parallel lateral margin run together distally 

 in a very broad curve. We may discern between two obliquely ascending lateral 

 thickenings and a deep median somewhat hour-glass-shaped depression, in the 

 proximal half of which is seen the half-elliplical inner aperture. 



Ooecia have not been found. 



Kenozooecia of a similar form and size as the zooecia are scattered among the 

 latter in rather scarce numbers singly or more together. 



The Closure takes place by means of a flat lamina which arises proximally to 

 the oral ledge. 



A Regeneration has not been seen. 



The Colonies. I have examined a number of laminate fragments consisting of 

 3 — 4 layers of zooecia, and to judge from these the colony seems to have had a 

 somewhat similar structure as that figured in d'ORBiGNv's pi. 784, fig. 12 and 

 referred to Clausimiillelea tuberculata. But while in this figure the sub-colonies 

 which compose the different layers partly appear as sharply defined small discs, 

 I have found no such in the few fragments of the present species, which present 

 ancestrulae, but the small sub-colonies, the ancestrulae of which are sometimes 

 placed very near to each other in a number of 2 — 7, are fused together, partly 

 by the aid of Kenozooecia of very different form and size. The only visible part 

 of such an ancestrula is the obliquely ascending aperture, and as the zooecia imme- 

 diately surrounding it have an ascending frontal wall, each ancestrular aperture is 

 the centre of a more or less deep depression, which may be elongate when two 

 ancestrular apertures are placed very near to each other (fig. 7). In a single frag- 

 ment 1 have found a short, cylindrical erect zooecium (fig. 8) arising between four 

 zooecia and a kenozooecium, and 1 must regard it as an ancestrula destined to 

 give rise to a new sub-colony. 



A number of fragments from Fecamp (Middle Senonian). 



Meliceritites tuberculata d'Orbigny. 



'.'Clausimultelea tuberculata d'Orbigny, Bryoz. Crét. p. 656, pi. 784, figs. 12 — 15. 



(pi. VI, figs. 1-3.) 



The Zooecia which are divided by distinct ridges and generally present a con- 

 vex or saddle-shaped distally oblitjuely ascending suboral area are of a rather 



5* 



