CORALS FROM THE SILURIAN FORMATION. 297 



irregularly twisted plates; inner area a little narrower than the outer area, from which it 

 is separated by a solid vertical wall, crossed by loose vesicular structure, curving upwards 

 and outwards, one, or rarely two, vesicular plates reaching across the area on each side ; 

 vesicular plates of the outer area more curved, slightly smaller, the rows inclining slightly 

 upwards and outwards, scarcely three cells in a row. A star 9 lines in diameter, has 

 the prominent circular portion, 7 lines in diameter, and the prominent axis rather more 

 than 1 line in diameter. 



" Not uncommon in the Wenlock limestone near Wenlock, Shropshire." M'Coy, 

 op. cit. 



Family CYSTIPHYLLID^, (p. lxxii.) 

 Genus Cystiphyllum (p. lxxii). 



1. Cystiphyllum cylindricum. Tab. LXXII, figs. 2, 2a, 2d. 2c. 



Fungites Gothlaxdicus, &c, Magnus Bromel, Act. Liter. Suec, vol. ii, p. 4G4, No. is, 



1728. 

 Cystiphyllum cylindricum, Lonsdale, in Murchison, Silur. Syst. p. 691, pi. xvi bis, tig. 3, 



1839. 

 — — Milne Edwards and Jules Flaime, Pol. Foss. des Terr. Palseoz. 



(Arch, du Mus., vol. v), p. 464, 1851. 



Corallum tall, turbinate when young, but becoming cylindrical by growth, and pre- 

 senting numerous irregular accretion ridges ; epitheca strong, and often presenting radici- 

 form tubercles or appendices, which sometimes accidentally unite several individuals 

 together. Calice circular, rather shallow, and entirely covered with large irregular vesicles, 

 but still showing some appearance of septal striae. A vertical section shows that the 

 vesicles are rather small, and very irregular. Height about 2 inches. 



Benthall Edge : Ardaun and Cong, Kerry (M'Coy.) 



Specimens are in the Collections of the Geological Society of London and of M. de 

 Verneuil. 



2. Cystiphyllum Grayi. Tab. LXXII, figs. 3, ?>a. 



Cystiphyllum Grayi, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz. (Arch, 

 du Mus., vol. v), p. 465, 1851. 



This species is very nearly allied to the preceding one, but the vesicles of the calice 



