41 



whole breadth in the distal part of tlie zooeciuni is about a third part longer than 

 broad, and provided with a distinct and sharply defined but narrow oral ledge. It 

 is roundedly triangular with a pointed distal part, and the arched lateral margins 

 which are somewhat incurved distally are more or less converging proximally. 

 The præoral tubercle either forms a large rounded swelling or a more or less de- 

 veloped beak-shaped projection. The convex or saddle-shaped distally pointed oper- 

 culum shows a flabelliform striation. 



The Heterozooecia which are spread among the zooecia in rather scarce num- 

 bers are much longer than the latter. The aperture consists of a broad proximal 

 part with distally converging lateral margins and a generally much longer (some- 

 times more than twice as long) narrow distal part with allmost parallel or very 

 little converging lateral margins. The mandible is distinctly convex not only from 

 side to side, but also proximally distally. 



Ooecia have not been found. 



The Kenozooecia have been found spread among the zooecia in scarce numbers 

 singly or more together. 



The Closure. A distinct closure has not been found. 



The Regeneration. There has been found no regeneration in the fragment 

 examined. 



Tlie Colonies are composite, and the fragment examined is a multilayered lamina 

 fixed to a piece of flint from Chatham or Luton (middle chalk). 



This species is evidently related to Mel. sarthacensis. 



Meliceritites Sarthacensis d'Orbigny. 



Reptelea Sarthacensis dOrbigny, Bryoz. Crét. p. 640, pi. 604, figs. 9—10, pi. 738, fig. 15. 



(PI. I, figs. 1-2.) 



The Zooecia, which are divided by distinct marginal ridges are more or less 

 regularly rhombic, as a rule double as long as broad, and the suboral area which 

 is often somewhat convex is as long as or a little shorter than the aperture. No 

 lateral tubercles. The triangularly rounded aperture whicli is a little longer than 

 broad has a narrow obliquely immersed oral ledge, and together with the well-de- 

 veloped peristomial thickening it takes up the whole breadth in the distal part of 

 the zooeciuni. Its distal end is strongly projecting in the shape of a robust roun- 

 ded beak (the præoral tubercle). The convex operculum shows a faint striation, 

 and as a rule most of its pores are arranged in two distally converging longi- 

 tudinal belts. 



The Heterozooecia which are in most cases a little longer than the zooecia are 

 spread among the latter in rather large numbers, and are provided with a trian- 

 gular aperture which may sometimes be twice as long as broad, sometimes only 

 a little longer. It has a broad proximal margin, and the two somewhat incurved 

 lateral margin are strongly converging towards the narrow roundedly pointed distal 



D. K. D. Vidensk. Selsk. Skr., 7. HjL'kke, natuividensk. og iiiiithem. .Vftl. \. I. ,• 



