TERTIARY CORALS. 43 



The columella hardly exists, and it is formed by a few offshoots from the inner margins 

 of the septa. 



The endotheca is scanty. 



The wall is thin above, but thick low down in the corallites. 



The exotheca is well developed ; its cells are small, and its upper or free surface is 

 but faintly marked. 



Height of corallum I inch. Diameter of corallites -^^t\i inch. 



Locality. — Brockenhurst. In the Museum of Practical Geology, London. 



3. SolenastrjEA Reussi, Duncan. Plate V, figs. 10 — 16. 



The corallum is tall, with an irregular upper surface. The corallites are subturbinate, 

 with wide calices and narrow bases ; they are irregular in their distances, but are con- 

 nected more by bands or layers of dense exotheca than by a cellular ccenenchyma, but 

 both structures exist.^ The calices are very slightly exsert, and irregular in shape and 

 distance. The fossa is shallow, and the margin is thin. The columella is very rudimen - 

 tary. The septa are very distinct, unequal, not always straight, thin ; and the highest 

 orders are rudimentary, but exist as small projections. There are six systems and five 

 cycles.^ The laminae are marked with granules in a series of slanting rows.' 



The endotheca is very scanty and highly inclined.* 



The wall is not very stout. 



The costse where uncovered by exotheca are distant, very slightly prominent, straight, 

 unequal, and very bluntly dentate. 



The exotheca forms layers which curve around the corallites, and connect them 

 together at certain heights only, the intermediate parts being uncovered by exotheca ; 

 the uppermost layer is more or less granular, and reaches to the calicular margin.^ The 

 layers are formed by elongated and very thick cells, and they rarely are square and thin. 

 The gemmation is extra-calicular, but several buds spring from the same wall, very close 

 to each other.^ 



Height of individual corallites ^th inch. 



Diameter of the calices ^th inch. 



Locality. — Brockenhurst. In the collection of Frederick Edwards, Esq., F.G.S. 



' Plate V, figs. 10, 11, 14. ^ Plate V, fig. 16. s pjate V, fig. 15. 



* Plate V, fig. 15. ^ Plate V, fig. 12. « Plate V, fig. 10. 



