17 



215 



collection of the Mineralogical INIuseum in which the porous character of the skeleton is 

 apparent, and on the wrapper of which is written: 'Dendrophyllia." However, this fact 

 in no way diminishes the credit due to Hennig. 



The coral forms woody, ramifying colonies. The older stems are slightly thicker than the 

 younger branches, but the difference is not great. The branches are formed by gemmation 

 from the outer side of the theca without any connection with a calyx. The new individual, 

 the new branch, first grows a slight distance at right angles from the parent stem, then 

 turns and continues its growth parallel to the parent stem. Branches may grow from every 

 side of a stem (table I, figs. 19 — 20). If two branches collide during their growth, a frequent 

 occurrence under intense furcation, they merge into one another, forming a complicated 

 net-like growth (table I, fig. 12). 



The theca is quite thick and, on account of the pores which are found throughout, 

 forms a spongy (lacunous) tissue making a kind of connection between the interseptal com- 

 partments and the outside world. The exterior is at most smooth, as a rule, however, it is 

 possible to distinguish slight costae which confine the porous parts of the tissue. Occasionally 

 the costae are more plainly marked and divide the outer surface into facets (table I, fig. 10). 



The calyx is quite deep and capacious, the free septal edges projecting only in the 

 hollow of the calyx and to a very limited extent. Not until the bottom of the calyx are the 

 septa able to reach the central formations. The free septal edge does not extend beyond the 

 thecal edge; it is practically unbroken and is not dentate. 



There are between 24 and 36 septa; 3 complete ordines and a fourth more or less in- 

 complete. The septa of the first and second ordines reach the center and by a coalescence 

 of their inner edges form a pseudo-columella of spongy consistency (table I; fig. 8). A cross- 

 section reveals the way in which this is formed from connate septal edges and shows that 

 it is not a true independent columella (table I, fig. 16). 



A lengthwise cut through the stems shows how the interseptal compartments close 

 to the calyx are closed by dissepiments. 



No endothecal formations are seen. The stone kernels are readily distinguishable from 

 the twisted fillings in the pores of the lacunous edges which are located within the inter- 

 septal fillings. 



Locality: Danien. Coral chalk from Faxe and Aggersborggaard. (Also known from 

 Annetorp). 



3. Sphenotrochus granulatus, n. sp. 



Table I. Figs. 23—25. 



This species is a single coral of very small dimensions. It is about 10 mm long with 

 a diameter at the edge of the calyx of about 2—3 mm. It is almost cylindrical in form, for 

 its lateral development soon ceases and the breadth remains constant during the further 

 growth of the coral. The axis is bent so that the coral is either curved once or in an S-form. 



The coral spreads a little at the base, forming an adhesive disc. 



D. K. D Vidensk, Selsk. Skr., nalurv. og malhem. Afd. 8. Række, V. 3. 28 



