CORALS FROM THE MOUNTAIN LIMESTONE. 181 
Found at Bristol, Corwen, Lofthouse in Nidderdale; its existence im Pembrokeshire 
and Wrekin is mentioned by Professor Phillips, and at Bakewell, Derbyshire, by Professor 
M‘Coy. Specimens are in the collections of the Museum of Practical Geology, of Bristol, 
of Cambridge, of Professor Phillips, at York, of the Paris Museum, &c. 
This coral is liable to some variations in form, which are shown in the figures given in 
this Monograph. The circular elevation which usually circumscribes the central calicinal 
fossula, and which is shown in fig. 1, does not exist in the specimen represented in fig. 3, 
and in the specimens represented in figs. 2 and 4a, the bottom of the fossula is become 
prominent. In the specimen, fig. 3, the corallites are pressed very closely together, and 
the intercalicular mural ridges are very thin and sharp, whereas in figs. 1 and 2 the 
approximation of the corallites not bemg carried so far, the mural ridges are thick and 
blunt. We may also remark, that in the specimen fig. 8 the septa are thicker than usual, 
but that peculiarity appears to be dependent on the process of fossilisation only. 
C. regium much resembles C. helianthoides ;' but in the specimens where the corallites 
remain free laterally, these are of an almost regular turbinate form, and their calice is not 
inverted exteriorly, so as to assume the form of a mushroom, as is always the case in 
C. helianthoides; the septa are also thinner and more numerous in the above described 
species than in the latter-mentioned one. 
CYATHOPHYLLUM CRENULARE, of Phillips,” appears not to differ specifically from 
C. regium, and to be only a variety with smaller calices. Accordmg to Professor 
Phillips this fossil is found at Clithero, Mendip, Bristol, and in Derbyshire. 
5. CYATHOPHYLLUM PaRRICIDA. Tab. XXXVII, figs. 1, la, 14. 
CYATHOPHYLLUM PaRactpAa, M‘Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. iii, p. 7, 
1849; Brit. Paleoz. Foss., p. 86, pl. tiie, fig. 9, 1851. 
— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz., 
p- 385, 1851. 
Corallum fasciculate and increasing by calicinal gemmation; the large calices bearmg 
three or four young corallites, which smother by their growth their parent. The corallites 
free laterally, conical or cylindroid, and not bearing circular accretion swellings. Calices 
circular. Septa not numerous (32), almost equal, thin, and united exteriorly by vesicular 
dissepiments. Zudule large and horizontal. Diameter of the corallum from 3 to 5 lines. 
From Mold, Derbyshire. Specimens are in the collection of the Museum of Practical 
Geology, of Cambridge, and of Paris. 
! Goldfuss, Petref. Germ., vol. i, tab. xx, fig. 2, and tab. xxi, fig. 1. 
2 Geol. of Yorkshire, 2d part, pl. ii, figs. 27, 28; Astrea crenularis, M‘Coy, Syn. of Carb. Foss. of 
Ireland, p. 187 ; Actinocyathus crenularis, D’Orbigny, Prod., vol. i, p. 160. 
