CORALS PROM THE MOUNTAIN LIMESTONE. 205 



Corallum astreiform; Corallites prismatic; principal septa extremely slender, broader, 

 and less numerous than in P. M l Coy ana} 



In a former work we referred this species to the Genus Stylaxis of Professor M'Coy, 

 because, from the inspection of the woodcuts given by that author in the 'Annals of 

 Natural History,' we had been led to suppose that Stylaxis differed from Lithostrotion, by 

 the existence of a well-developed septal apparatus, and a lamellar columella; but the 

 figures recently published by the same geologist prove that we were mistaken, and that 

 the Genus Stylaxis of Professor M'Coy does not in reality differ from Lithostrotion ; we 

 have, therefore, beien obliged to abandon that name, and to establish here a new generical 

 division (Petalaxis), for the fossils which we formerly named Stylaxis M'Coy ana 2 and 

 S. Portlocki. 



2. Genus Axophyllum, (p. lxxii.) 



Axophyllum radicatum, Milne Edwards and Jules Haime, Pol. des Terr. Palaeoz., p. 456 ; 



tab. xii, fig. 1, 1851. 



We are inclined to think that the fossil coral, found by Col. Portlock in the car- 

 boniferous limestone at Stewartston, Tyrone, 3 and referred by that Geologist to the 

 Turbinolia verrucosa of Hisinger (which is an Omphyma of the Silurian formation), 

 belongs to this species, or is closely allied to it. 



3. Genus Lonsdaleia, (p. lxxii. 4 ) 

 1. Lonsdaleia floriformis. Tab. XLIII, figs. 1, \a, \b, \c, Id, le, 2, 2a. 



Stone found in Wales (?), Llwyd, Phil. Trans., vol. xxi, p. 187, No. 252, figs. 3, 4, 1/00. 



Very rough figures. 

 Erismatolithus madreporites (floriformis), William Martin, Petref. Derb., tab. xliii, 



figs. 3, 4, and tab. xliv, fig. 5, 1809. 

 Stylina compound, Parkinson, Introd. to the Study of Foss. Org. Rem., pi. x, fig. 5, 1822. 



Good. 

 Astrea Florida, Defiance, Diet. Sc. Nat., vol. xlii, p. 383, 1826. 

 Lithostrotion floriforme, Fleming, Brit. Anim., p. 508, 1828. 



— — S. Woodward, Table of Brit. Org. Rem., p. 5, 1830. 



Columnaria floriformis, De Blainville, Diet. Sc. Nat., vol. lx, p. 316, 1830; Man., p. 350. 

 Cyathophyllum floriforme, Phillips, Geol. of York, vol. u, p. 202, 1836. 



1 Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaeoz., p. 453, pi. xii, fig. 5. 



2 Polyp. Palaeoz., p. 453, tab. xii, fig. 5. 3 Report on Londonderry, p. 331. 

 * Under the name of Lithostrotion. 



