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 A, (p. Ixxii.) 
Genus CYSTIPHYLLUM (p. Ixxii). 
1. CystipHYLLUM CYLINDRIcuM. Tab. LXXII, figs. 2, 2a, 2d. 2c. 
Funeites Gorutanpicus, &c., Magnus Bromel, Act. Liter. Suec., vol. 11, p. 464, No. 18, 
1728. 
CysTIPHYLLUM CYLINDRICUM, Lonsdale, in Murchison, Silur. Syst. p. 691, pl. xvi bis, fig. 3, 
1839. 
— a Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz. 
(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. Cadice circular, rather shallow, and entirely covered with large irregular vesicles, 
but still showing some appearance of septal striz. 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. CysripHYLtum Grayi. ‘Tab. LXXII, figs. 3, 3a. 
CystreuyLLum Gray, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz. (Arch. 
du Mus., vol. v), p. 465, 1851. 
‘This species is very nearly allied to the preceding one, but the vesicles of the calice 
