TERTIARY CORALS. 45 



There are six systems of septa, and four complete cycles ; moreover, in the largest 

 corallites there are many rudimentary septa of the fifth cycle. The septa are unequal 

 in the sectional view ; often larger (the primary) at the inner end than midway; and mav 

 extend across the columellary space. A little below the calice the wall is very thick, and 

 the endotheca is most abundant and very inclined. The costee exist above the level of 

 the common coenenchyma; they are alternately large and small, but always short, ill 

 developed, and faintly dentate. 



The exotheca is greatly developed ; its cells are irregular in shape, not elongate, but 

 more or less square in outline -^ it covers up the corallites, leaving them free to a small 

 extent only. The upper surface of this exothecal coenenchyma is faintly granular. 



Height of corallum 1 inch. Great diameter of calices ^th to ^Ijth inch. 



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



6. SoLENASTRiEA GRANULATA, jDuncati. Plate VI, figs. 14 — 18. 



The corallum is short, and its upper surface presents much granular ccenenchyma^ 

 between the calicular ends of the corallites. The corallites are small and distant ; and 

 in well-preserved specimens are seen to project somewhat above the common exothecal 

 coenenchyma, but in worn fossils they are but slightly elevated, and present a very thick 

 wall. The calice is circular in outline, its fossa is shallow, its margin is thin ; and the 

 columella is rudimentary. 



There are six systems of septa and four cycles of them ; they are unequal, the 

 primary being much the largest,^ and all except those of the fourth and fifth orders have 

 a paliforra elevation near the columellary space. 



The septa are rugged laterally, from their connection with much endotheca, which is 

 highly inclined. 



The costae are seen above the surface of the coenenchyma as short ridges alternately 

 large and small, and they appear to emerge into the large granules on the free surface of 

 the coenenchyma ; where the corallites are not covered by exotheca below the free surface, 

 the costse are also visible. 



The exotheca is cellular and banded.* The occurrence of the bands admits of much 

 corallite wall being costulated. 



The free surface of the exotheca is dense and covered with large granules. 



Height of corallum \ inch. Diameter of calices ^th inch. 



Zoca/^7^.^Brockenhurst and Roydon. In the collection of Frederick Edwards, Esq., 

 F.G.S. , and in the Museum of Practical Geology, London. 



All these species present the most important generic characteristic of the Solenastrcece, 

 and they are all very closely allied. The principal specific distinctions are in the amount 



> Plate VI, %. 9. . ,- Plate VI, fig. 14. 3 Plate VI, fig. 17. 



* Plate VI, figs. 15, 16. 



