PKOM THE GREAT OOLITE. 179 



Genus Bartsmilia. 



I have long known Barysmilia as a Cretaceous genus in this 

 country ; but until quite recently was unaware of its presence in the 

 Oolitic formation either in England or elsewhere. Two examples 

 were, however, taken by me during the present year (1884) from 

 the coralliferous layer in the quarry on Combe Down, of which I 

 have given a section. So long ago as 1859 M. Etallon made known 

 the existence of three species of corals in the Corallian beds of the 

 Haut-Jura, attributable to the genus Bai^ypTiyllia of M. de Fromen- 

 tel *. That genus differs chiefly from Bcuysmilia in having denticu- 

 lated septa. At present I am unable to observe the least evidence 

 of denticulations on the septa of the specimens from Combe Down, 

 and am compelled, therefore, to refer them to the genus Barysmilia. 

 If, however, the specimens here mentioned have lost the denticula- 

 tions of their septa, which is very probable, the already acknow- 

 ledged Jurassic genus Baryjphyllia will have to be substituted for 

 Barysmilia. 



Barysmilia Etalloni, n. sp. (Plate V. figs. 1-4.) 



The corallum has an irregular subglobose form, a little higher than 

 wide, the lower part being peduncular and attached by a small base. 



The whole of the peduncular part, as well as the space around and 

 between the calicos, is ornamented with costse, which are regular, long, 

 and anastomosing, and, near to the calicos, more or less papillated. 

 On the lower part of the corallum they are less distinct and nearly 

 smooth. In the bottom of the hollows, between the calicos, there 

 is sometimes a distinct line of demarcation between the costae sur- 

 rounding the several calicos, which has something of a herring-bone 

 arrangement. 



The calices are rather distant, the intervals between them being 

 in all cases greater than their own diameter ; but they approximate 

 most nearly to each other on the top of the corallum. They are 

 extremely variable in length, and occur as a simple oval, shaped 

 like a figure 8, like the letter S, or like a more or less irregular 

 cross. The longest calico I have seen has a very serpentine form, 

 which, if straightened out, would have sufficient length to pass over 

 the whole of the corallum, from the base on the one side, in a line 

 over the top, to the base on the other side. The margins of the calices 

 are prominent ; they are rather deep, and the septa are thin, irre- 

 gularly developed, and continuous with the intercalicular costse. 



In a simple ovoid calico I can determine about fifty septa, about 

 twelve of which, constituting the first and second cycles, pass into 

 the fossula, where they unite and form a very irregular but dense 

 columella, which in the long calices appears as a rugged but pro- 

 minent line of very variable thickness, which is continued the whole 

 length of the calico. 



Stylosmilia beptaj^s, n. sp. (Plate Y. figs. 18-21.) 



The corallum consists of short tufted masses, rarely exceeding an 

 * Etud. Paleont. Terr. Juras. Haut-Jura, p. 93. 



