170 BRITISH FOSSIL CORALS. 



4. Zapiirentis Enniskilleni. Tab. XXXIV, fig. 1. 



Zaphrentis Enniskilleni, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz. 



p. 334, 1851. 



Corallum conical, slightly curved, pointed at its under end, covered with a thin 

 epitheca, and not showing any circular accretion swellings. Calice circular, very deep, 

 and terminated by a thin margin. Septal fossula well marked, situated towards the 

 concave or ventral side of the corallum, and not reaching quite to the centre of the visceral 

 chamber. Principal septa numerous (about forty), very thin, extremely narrow upwards, 

 and straight or but very slightly curved inwards ; two of them somewhat larger than the 

 others, and forming an angle at the end of the septal fossula. An equal number of small 

 septa alternating with the principal ones. Height of the corallum 3 inches ; depth of the 

 calice more than half that length; diameter of the calice 1^ inch. 



The only specimen that we have seen was presented to the Geological Society by Lord 

 Enniskillen, and had been found by that Palaeontologist at Loughgill, in the county of 

 Sligo. 



This species may easily be distinguished from all the other known Zaphrentis by the 

 great depth of its calice and the position of the septal fossula. 



5. Zaphrentis Bowerbanki. Tab. XXXIV, figs. 4, 4a. 



Zapiirentis Bowerbanki, Milne Edwards and Jules Haime, Polyp. Foss. des Terr. Palseoz., 



p. 338, 1851. 



Corallum very long, almost cylindrical, strongly curved, terminated by a narrow 

 peduncle, covered with a strong epitheca, and presenting well-marked circular constric- 

 tions, and accretion swellings. Calice circular. Septal fossula very small, almost central, 

 situated towards the ventral or concave side of the corallum, and divided at its basis by 

 the principal septum, which extends to some distance in its cavity. Principal septa not 

 numerous (24), very thin, somewhat unequal, and extending almost to the centre of the 

 calice ; rudimentary septa alternating with the principal ones. Height of the corallum 

 2 or 3 inches ; diameter of the calice, 6 lines. 



Found at Oswestry, at Frome, and in Ireland. Specimens are in the Collections of 

 the Museum of Practical Geology, of the Geological Society, of Mr. Bowerbank, and of the 

 Paris Museum. 



This species is remarkable for the smallness of its well circumscribed, sub-central 

 fossula, and by the way in which one of the primary septa extends into its cavity. By 

 the great development of this septum Z. Bowerbanki approximates somewhat to the genns 

 Hallia ;* but, in the latter, the septal fossula does not exist. 



1 See Introduction, page Ixvii. 



