10 BRITISH FOSSIL CORALS 



5. Tkociiosmilia (Ccelosmilia) granulata, Z)««m«. PI. IV, figs. 1 — 4; PI. VI, fig. 9. 



The corallum is tall and slightly curved, and it has a long pedicel, with a very distinct 

 base. 



The corallum is slightly compressed, and bulges here and there. 



The costiB are well marked, distant, subequal, and intensely granular. The larger 

 costse are more distinct inferiorly and midway than close to the calicular margin ; they 

 are cristiform in some places, notched by chevron-shaped ornamentation in others, and 

 occasionally sharply pointed or absent. The spaces between the larger costae are wide, 

 faintly convex, and are marked longitudinally by small costse, and transversely by wavy 

 or chevroned ornamentation. 



The whole external surface of the corallum is very granular. 



The calicular wall is very thin, and the calice is elliptical. 



There are three perfect cycles of septa, and some orders of the fourth cycle in some 

 of the systems. The septa are wide apart, slightly exsert, unequal, and slender. They 

 do not reach far inwards at once, but dip downwards with a gentle curve. 



In a section the inner margin of the larger septa is wavy. 



The endotheca is scanty. 



Height, l|rds inch. Length of calice, Jths inch ; breadth, |rds inch. 



Locality. Norwich, and Chalk of south of England. In the British Museum 

 (Dixon Collection). 



6. Trochosmilia (Ccelosmilia) cylindrica, Duncan. PI. V, figs. 1 — 3. 



The corallum is tall, cylindrical, and very slightly bent. The calicular opening is 

 smaller in diameter than the rest of the corallum. 



The costse are nearly equal, broad, slightly rounded, and are separated by shallow, 

 narrow, and undulating intercostal grooves. The costse are profusely ornamented with 

 transverse ridges, straight, curved, or angular, and with large granules. 



The calicular edge is very thin, and the broad convex costse are continuous with 

 slender, unequal septa. 



There are four cycles of septa. The primary are exsert, and the laminse of the higher 

 orders are very small. 



There is no columella, the larger septa are united by a few short attachments from 

 their inner margins. 



The endotheca is scanty. 



Height, several inches. Breadth of the calice, iths inch. 



Locality. Norwich, Upper Chalk. In the Collection of the Rev. T. Wiltshire, F.G.S. 



