186 BRITISH FOSSIL CORALS. 



its septa being more numerous and flexuous inwardly, and from C. Bowerbanki, 1 by the 

 irregular arrangement of the septa near the columellarian protuberance. C. Keyserling? 

 is more bent, has larger accretion ridges, the interseptal loculi more vesicular, and the 

 septa being less numerous. 



3. Clisiophyllum Bowerbanki. Tab. XXXVII, figs. 4, 4a. 



Clisiophyllum Bowerbanki, Milne Edwards and Jules Haime, Pol. Foss. des Terr. 



Palseoz., p. 411, 1851. 



Corallum conical, elongate, curved, very narrow at its basis, and presenting but very 

 slight circular accretion swellings. Calice circular. Septa 70, or more ; the principal 

 ones rising up towards the centre of the corallum, where they become flexuous ; eight of 

 them larger than the rest, and reaching to the top of the columellarian protuberance. 

 Height of the corallum about 2^ inches ; diameter of the calice about 12 or 14 lines. 



The specimen here described was found in the Carboniferous Deposits of Ireland, and 

 belongs to the collection of our friend, Mr. J. S. Bowerbank. 



This species is characterised principally by the unequal development of its principal 

 septa, eight of which only extend to the top of the columellarian protuberance. It most 

 resembles C. coniseptum, 5 but independently of its being much shorter, it differs from this 

 Coral by its septa being much more numerous in proportion to the size of the visceral 

 chamber. 



Clisiophyllum bipartitum of Professor M'Coy, 4 much resembles this species, but 

 appears to differ somewhat from it by the mode of arrangement of the principal septa. It 

 was found in Derbyshire. 



4. Clisiophyllum Keyserlingi. 



Clisiophyllum Keyserlingii, M'Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 2, 



1849. 



— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. 



Palseoz., p. 412, 1851. 



— — M'Coy, Brit. Palseoz. Foss., p. 94, pi. iii c, fig. 4, 1851 . 



Corallum conical, and very elongate; curved, and presenting rather strong circular 

 swellings. Calice circular. Columellarian protuberance conical, and formed by the pro- 

 longation of the principal septal radii, twisted round the axis of the corallum. Principal 



1 See tab. xxxviii, fig. 4. 2 Professor M'Coy, Ann. and Mag. of Nat. Hist., s. 2, vol. iii, p. 2. 



3 See tab. xxxvii, fig. 5. * Ann. and Mag. of Nat. Hist., s. 2, vol. iii, p. 2. 



