60 BRITISH FOSSIL CORALS. 



Family.— OCULINIDiE. 



Tribe. — OculinacejE. 



Genus. — Oculina. 



1. Oculina incrustans, Duncan. Plate IX, figs. 22 — 24. 



The corallum is small and encrusting. There is much cceneuchymaj but it is not 

 granular on the surface ; it is marked near the calices by very faint costal ridges. 



The calices are arranged without order, and are situated upon more or less prominent 

 eminences ; they are usually circular in outline, but there are indications of fissiparity. 

 The calicular margin is sharp, the fossa is shallow from the presence of a large and 

 prominent columella, and the spaces bounded by the columella, the margin, and the 

 primary septa are deep. 



The primary and secondary septa are long and nearly equal ; they reach the columella 

 and appear to be extended over its upper surface, but this appearance is really produced 

 by the pali. 



There are four cycles of septa, and six systems ; but the septa of the fourth and lifth 

 orders are very small. All the septa are delicate, rather narrow, and very unequal, except 

 in the case of the primary and secondary. 



The pali are before all the septa, except those of the last cycle ; they are small and 

 indistinct. 



The columella is bulky, projected, rounded, and probably was papillated. 



The costse are very faintly marked, are not straight, and can hardly be said to exist. 



Height of calicular projections ^ths inch. Diameter of calice fgths inch. 



Locality. Bracklesham. In the Sharpe Collection of the Geological Society, 



The deficiency of granular coenenchyma, the existence of additional septa, the bulky 

 columella and the thin pali, distinguish this species from 0. conferta. 



2. Oculina Wetherelli, Duncan. Plate X, figs. 5 — 7. 



The corallum is short, has a very broad base for its size, is constricted above the base, 

 and expands into a calice. It increases by gemmation just below the caUcular margin ; 

 many buds are aborted. 



The surface is very finely granular under high magnifying powers, but smooth to the 

 naked eye. 



The calice is nearly circular in outHne, and has a moderately thick wall and a deep 

 fossa. 



