K. F. TOMES ON THE OEEAT-OOLITE MADEEPOEAErA. 175 



ZOANTHARIA APOftOSA. 



Family OCULINID^J. 



Genus Enallohelia, d'Orbigny. 



M.de Frornentel, in his general work on Fossil Corals (Introduction 

 a l'Etude des Polyp. Fossiles), makes an important addition to the 

 definition of this genus by MM. Milne-Edwards and Haime, as given in 

 their 'Histoire Naturelle des Coralliaires,' in the following words: — 

 " Cloisons subentieres et prcsentant des lobes paliformes pres de la 

 columelle." The species I have now to describe appears to fall under 

 this definition of the genus pretty accurately ; but I have failed to 

 notice this peculiarity of the septa in specimens of either Endllohelia 

 compressa or E. elegans from the Corallian of Nattheim. Nor has 

 M. de Eromentel himself, in the figure of E. minima*, given the 

 least indication of a paliform lobe near the columella. 



£:nallohelia clavata, n. sp. Plate VII. figs. 12-14. 



The branches decrease in size as they ascend, but very gradually. 

 They are smooth, but are regularly furnished over the whole of their 

 surface with regular and delicate papillae ; and the mural costae are 

 only observable near the margin of the calices, where they correspond 

 with the septa. 



The calices (fig. 14) are irregularly alternate in their position; they 

 have a diameter equal to that of the branches, and are prominent. 

 They are round and rather deep. 



The columella is small, irregular, and has little prominence. 



The septa are in six systems ; and there are three cycles. Those 

 of the primary cycle are of nearly equal thickness throughout, and 

 approach very near to the columella, where they terminate in a 

 pillar, which, when seen from above, looks like a rounded knob, and 

 gives to the upper margin of the septa the appearance of a club. 

 Their sides are ornamented with very distinct vertical ridges, which 

 resemble the ridges seen on the septa of a great many of the Astrceidce ; 

 and their margins are subentire. The secondary and tertiary septa 

 are nearly of a length, which is about half that of the primary 

 ones. Neither the secondary nor the tertiary septa have the club- 

 shaped termination observed in the primary ones. 



Diameter of the branches 1| line to 3 lines. 



This species bears a little resemblance to E. minima, Eromentel, 

 in having six primary septa ; but it has three cycles instead 

 of two. From E. minima it differs by the presence of a paliform 

 tooth or club-shaped termination of the septa. E. crassa and E. 

 elongata of Fromentel have only two cycles of septa, while the 

 present new species has three. E. crassa, however, has the septa 

 denticulated near the columella. 



In four instances only has this species been met with at Fairford, 

 where it was obtained by Miss Slatter. All are fragments. 



But at Broughton, near Banbury, in a quarry in the Great Oolite, 



* Polyp. Cor. des environs de Gray, pi. viii. fig. 7. 



