FROM THE OOLITIC STRATA. 19 



Genus — Symphtllia, Ed. Sf H. 

 1. Stmphyllia Etheridgei, Duncan. PI. VI, figs. 5 — 8. 



The corallum is nodular in shape ; the base is uneven, and the sides and upper 

 surface are irregular, convex, and gibbous. The remnants of a basal epitheca exist and 

 the costae of the calices end in a wall vi^ith which the costse of the base are continuous 

 (fig. 8). 



The calices are irregular in shape and size, and often form short series. The intercalicular 

 spaces are broad, and are marked by the costse which are continuous with the septa. 



The septa are numerous, very unequal, and crowded. The larger reach to the 

 columellary space, and the small are almost rudimentary. 



In small calices the fifth cycle is incomplete. 



The columella is small and not always visible. 



The dissepiments are close and join the septa so as to resemble synapticulse. 



Height of corallum If inch. 



Breadth of corallum 2f inch. 



Breadth of calices i-oths to i-oths inch. 



Locality. Crickley. Inferior Oolite. 



In the Collection of Dr. Wright, E.G.S., Cheltenham. 



This is the earliest representative of the genus Symphyllia, and its derivation from a 

 TJiecosmilia does not admit of much doubt. 



Family— EUNGID^. 



Genus — TnAMNASTRiEA. 

 1. Thamnastr^a Walcotti, Duncan. PI. IV, figs. 5 — 10. 



The corallum is moderate in size and of a flat conical shape. 



The apex of the cone is truncated and forms the inferior part or peduncle of the 

 corallum which was adherent. 



The base of the cone is inferior and is flat, and there is a tendency to inequality and 

 curving of the margins. -* 



The epitheca is well developed, rigid, and marked with transverse lines ; where 

 abraded it permits the subequal moniliform costse to be seen and their connecting 

 synapticulse. 



The calices are large, flat, shallow, and tolerably well defined, and are separated by 

 much cceneucliyma covered with costse. ^ 



