286 BRITISH FOSSIL CORALS. 



centre ; vertical section, apex filled with solid matter, centre with irregular vermicular lines 

 (the sections of the complicated edges of the radiating lamellae), from thence to the walls 

 made up of small thick rounded vesicular plates, the obscure rows having a slight 

 downward curve." 



" Not uncommon in the Wenlock limestone of Dudley, Staffordshire." M'Coy, op. cit. 



8. CYATHOPHYLLUM ? VORTEX. 



Clisiophylltjm vortex, M'Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. vi, p. 277, 1850. 

 _ _ M'Coy, Brit. Palseoz. Foss., p. 33, pi. i b, fig. 18, 1851. 



" Corallum simple, conic, slightly curved, enlarging at the rate of one inch eight lines in 

 three inches from the apex ; outer wall thin, faintly marked with subequal longitudinal 

 lamellar striae (5 or 6 in the space of 3 lines at a diameter of one inch), and small con- 

 centric wrinkles ; at a diameter of one inch the horizontal section shows an outer area of 

 about 60 thick, equal, radiating lamellae, barely reaching one fourth of the diameter 

 towards the centre, connected by small irregular transverse vesicular plates ; a few of the 

 pairs have a very thin, short, marginal lamella between each of the larger pairs, and where 

 this occurs the vesicular transverse plates become much more numerous ; inner area rather 

 more than half the diameter, forming a circular mass of confused vesicular tissue, crossed 

 by a few arched radiating delicate lamellae ; vertical section, having the narrow outer area 

 on each side (corresponding to the lamelliferous zone) of arched vesicular plates, 

 forming large unequal horizontal or slightly inclined cells, 1 or 2 cells extending across 

 the width of the area ; wide inner area composed of small oval cells, arranged in much- 

 curved transverse rows, the convexity of the curve upwards. 

 " Wenlock limestone, Wenlock, Shropshire." — M'Coy, op. cit. 



Turbinolia fibrosa, Portlock, 1 is a cast found at Desertcreat, and appearing to belong 

 to Cyathophyllum, but is not sufficiently characterised to be determined specifically. 



The same remark is applicable to the fossil figured by Professor M'Coy under the 

 name of Petraia zigzag? It is a cast of the interior of the visceral chamber of a coral 

 which, in all probability, belongs to the genus Cyathophyllum, and had very flexuous costae. 

 It is found in the Silurian formation at Ardaun, Cong, Galway. 



Several other casts that are not determinable specifically, and which have been referred 

 to the non-characterised genus Turbinolopsis or Petraia, appear also to belong to this 

 group. For example : 



Turbinolopsis elongata, Phillips, 3 a specimen of which belongs to the Collections of 

 the Geological Society, and found at Leach Heath, Bromsgrove Lickey. We have figured 



1 Report on the Geol. of Londonderry, p. 329, pi. xx, fig. 7. 



2 Sil. Foss. of Ireland, p. 60, pi. iv, fig. 17. 



3 Brit. Palseoz. Foss., p. 6, pi. ii, fig. 6 b, 1841. 



