FROM THE ZONE OF AMMONITES ANGULATUS. 21 



The ccenenchyma is abundant, and is elevated between some calices and flat between 

 others. 



Height of the corallum iths inch. 



Locality. — Brocastle. In the Collection of Charles Moore, Esq., F.G.S., Bath. 



7. AsTROccENiA cosTATA, Duncau. PI. IX, figs. 15, 16, 17. 



The corallum is small, irregular in shape, and rounded above. 



The calices are numerous, and rather deep ; they are either very close together, 

 or they are separated by more or less ccenenchyma, whose upper surface is marked by 

 wavy costse. 



The septa are usually twenty in number, and their costal ends are nearly equal. 



The costse are either very small, small and curved, or large and more or less curved 

 as they approach the costse of neighbouring corallites. 



The columella is small. 



The space occupied by three large calices, separated by much ccenenchyma, is 

 /gths inch. 



Locality. Brocastle. In the Collection of Charles Moore, Esq., F.G.S., Bath. 



8. AsTROccENiA FAvoiDEA, Duucan. PL IX, figs. 12, 13, 14. 



AsTR^A FAVOiDES? Quetistedt, Der Jura, 1858. 



The corallum is more or less globose, and the calices are very small, veiy deep, and are 

 separated by sharp ridges. The ccenenchyma is rudimentary. 



The septa are twenty in number, the smaller being very rudimentary. 



The costse are rudimentary. 



The columella is small, and is situated at the base of the very deep calice. 



Localities. Brocastle. In the Collection of Charles Moore, Esq., F.G.S., Bath. 

 Also in the Arieten-Kalk of Germany. 



9. ASTROCCENIA suPERBA, Duncan. PL IX, figs. 3, 4, 5. 



The corallum is small, and irregular in shape. 

 The calices are shallow, wide apart, and usually circular in outline. 

 The septa are usually twenty in number, are small near the columella, and thicker at 

 the costal end. About one half of them reach the columella. They are dentate. 



