220 



22 



The coral is small. The largest known specimens measure about 15 mm from base 

 to edge of calyx and have a diameter of about 4 mm. 



It is almost obovate-conical in form, increasing slightly in thickness towards the edge 

 of the calyx. The coral was fastened to the bottom of the sea, or to solid bodies on the bottom 

 by means of a stem and a flat, spreading, basic part, which on its under side shows the im- 

 pression of the object to which it was attached. The upper side of the basic extension is 

 either smooth or has faint longitudinal lines. 



The usual form, then, is nearly obovate-conical, but seldom entirely regular as the 

 extension often changes resulting in an irregularly bent form. Sometimes growth ceases 

 suddenly and the interseptal compartments are closed with a tabular-like formation. A 

 new individual then grows forth from some portion of the calyx, possibly at right angles to 

 the original extension. 



The theca is thick and solid, covered with a smooth epithecum which in rare instances 

 permits the costae to shine through. Sometimes horizontal folds are observed. Septa are 

 almost constantly present to the amount of 48, arranged in 5 ordines of 4 cycles. 6 of the 

 first ordo are larger than the others and are easily recognizable in the calyx. Together with 

 the 6 of the second ordo they form, by means of their inner edges, a pseudo-columella which 

 reaches up to the bottom of the calyx and are readily observed here as slightly ruffled chalk 

 leaves. 



The edge of the septum does not protrude beyond the edge of the calyx; it is not entire 

 but forms a few large patches in the calyx. Further down it billows from one side to another 

 and unites with the neighboring septal edges. In this way the spongy pseudo-columella is 

 formed. 



The sides of the septa are covered with rows of granulations which are sometimes large 

 and sharp enough to form thorns. These thorns do not unite with similar growths from 

 adjacent septa, but form, especially on the lower sections of the coral, scattered dissepiments 

 which close the interseptal compartments. 



Locality: Danien: Younger Danien: Coral chalk from Faxe and Aggersborggaard ; 

 bryozoa chalk from Faxe. 



11. Trochocyathus hemisphaericus, n. sp. 



Table II.- Figs. 14—15. 



This species is found in cerithium chalk from Stevns Cliff. Both stone kernels and 

 impressions are known. 



The theca is almost hemispherical, it was once free. Smooth costae have protruded 

 from the outer surface broken by very pronounced rings of growth. 



The stone kernel is 15 mm in diameter, 10 mm long. It shows Iraces of 60 sepia of 

 which the 6 primary were the largest. 



The septal edge has not extended beyond the lliecal edge, but lias penetrated almost 

 immediately into the rather shallow calyx, where it joined the columella. The sides of the 

 septa were covered with rows of prominent granulations. 



