R. F. 103IES OX THE GREAT-OOLITE MAD REP OR ARIA. 183 



trichotoma and T. annularis. In the present species they retain 

 their circular outline until two principal septa have met in the 

 centre of the calice and divided it in half, or perhaps, as is occa- 

 sionally the case, three septa have equally divided it into three 

 triangular spaces. 



Externally the corallites are rather rugose, and have a well-de- 

 veloped epitheca, marked with irregular circular constrictions, which 

 are not, however, the effect of rejuvenescence. 



The calices are rounded and rather shallow. The septa are irre 

 gular, owing to the different ages of the calices in near approxi- 

 mation to each other, and owing also to the primary ones of some 

 systems uniting in the centre of the calice while in others both 

 primary and secondary septa meet and run together. They are 

 thick, rude, and sometimes decrease in size inwards, while at other 

 times they become thicker towards the centre, where a considerable 

 number blend together and form a false columella. In some of the 

 systems there are three cycles and the rudiments of a fourth ; but 

 quite as freqently there are only three. 



It appears to be not uncommon at Eairford, and is also met with 

 near Burford. 



I entertain little doubt that the present species was figured by 

 Prof. Duncan, in his « Supplement to the British Fossil Corals,' as a 

 variety of Cladopliyllia Baheana*. 



Genus Eavia, M.-Edw. and Haime. 



Although no reeord has at present appeared of the uccurrence of 

 the genus Favia in the English Oolites, I have for a long time been 

 in possession of a specimen from the Stonesfield Slate. More recently, 

 by the kindness of Mr. J. Windowes, of Chipping Xorton, I have 

 become possessed of a species of this genus which he found in the 

 Inferior Oolite of the railway-cutting near Hook Norton, Oxfordshire, 

 from which place I have also subsequently taken specimens. But 

 before this, I had myself taken a Favia from the Inferior Oolite, in 

 the excavation made -for iron- ore at Eawler, near Charlbury, 

 Oxfordshire. Subsequently, that is during the present year (1882), 

 I met with another example in the debris washed to the bottom of a 

 gully on the south side of the valley at Crickley Hill, near Chelten- 

 ham. These several examples of the genus have not yet received 

 that close examination which is essential for their proper determin- 

 ation, excepting the one from the Stonesfield Slate ; but they are here 

 mentioned as corroborative testimony of the existence of the genus 

 in the Jurassic deposits of this country. 



Eavia peduxculata, n. sp. Plate VII. figs. 1G, 17. 



The corallum is small and pedunculate and has a subgiobular 

 and overhanging head. The peduncle tapers downwards to an 

 obtuse point, by which it was attached, and is furnished with regular 

 and delicate costae. There is no epitheca. 



* Plate iii. figs. 1,2, and 3. 



