50 

 Meliceritites punctata d'Orbigny. 



Myriozoum punctatum d'Orbigny, Kryoz. Crét. p. 603, pi. 783. figs. 4 — 7. 

 (PI. V, figs. 6-8.) 



The Zooecia, which are not divided by marginal ridges, are provided with more 

 or less, large and deep pits, the number of which increases with age, and in old 

 zooecia they are divided from each other by a rich net-work of prominent ridges. 

 The half-elliptical aperture which lacks a distinct oral ledge is provided with a 

 generally strongly developed and much raised perislomial thickening. The convex 

 operculum presents a flabelliform striation. 



The Heterozooecia, most of which are longer than the zooecia, are spread among 

 the zooecia in rather large numbers, either singly or two placed near together. 

 The elongate aperture is in the smaller of them triangular the two lateral margins 

 converging distally in their whole length, but in the larger the distal half is bor- 

 dered by two allmost parallel lateral margins. The concave surface distal to the 

 inner aperture has no lateral projections or thickenings. In a few heterozooecia I 

 have seen a calcareous mandible (fig. 8). 



Ooecia have not been found. 



No Kenozooecia. 



A Closure by means of a concave lamina has only been seen in a few zooecia. 



The Regeneration. While a distinct regeneration of new zooecia in old ones 

 has not been seen, there can be no doubt that the form and position presented by 

 some of the heterozooecia in a single of the colonies examined can only be explained 

 from a regeneration of new heterozooecia in old ones. While the aperture of the 

 common heterozooecia is about parallel to the axe of the colony the aperture of these 

 heterozooecia forms an angle of up to 130 degrees with the surface of the latter, and 

 in consequence hereof they are provided with two large, triangular or Irapeziform 

 lateral surfaces which show the same pitted appearance as the zooecia. How many 

 times the regeneration has taken place in the single heterozooecia cannot be seen be- 

 cause of the rich deposition of calcareous matter which goes on over the surface 

 of the whole colony and to which the pitted appearance is due. 



The Colonies are incomposite, and the examined cylindrical fragments are pro- 

 vided with 10—14 zooecia in the transverse series. 



I have examined a number of specimens from Vendôme (zone with Crania 

 ignabergensis). 



Meliceritites Dollfusi Pergens. 



Meliceritites Dollfusi Pergens, Révision d. Hryoz p. 395, pi. XIII, fig. 4. 

 Meliceritites loiisdalei Gregory, Cret. IJryoz. p. 335, pi. XV, figs. 5-9. 

 (PI. IV, fig. Xi.) 



The Zooecia which are as a rule twice as long as broad are divided by more 

 or less distinct marginal ridges, and the concave or saddle-shaped suboral area 



