CORALS PROM THE MOUNTAIN LIMESTONE. 181 



Found at Bristol, Corwen, Lofthouse in Nidderdale ; its existence in 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 being carried so far, the mural ridges are thick and 

 blunt. We may also remark, that in the specimen fig. 3 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 ; l 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, 2 appears not to differ specifically from 

 C. regium, and to be only a variety with smaller calices. According to Professor 

 Phillips this fossil is found at Clithero, Mendip, Bristol, and in Derbyshire. 



5. Cyathophyllum parricida. Tab. XXXVII, figs. 1, la, lb. 



Cyathophyllum pakacida, M'Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. iii, p. 7, 



1849; Brit. Palseoz. Foss., p. 86, pi. iii e, fig. 9, 1851. 

 — — Milne Edwards and Jules JTaime, Pol. Foss. desTerr. Palseoz., 



p. 385, 1851. 



Corallum fasciculate and increasing by calicinal gemmation ; the large calices bearing 

 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. Tabula 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. 



1 Goldfuss, Petref. Germ., vol. i, tab. xx, fig. 2, and tab. xxi, fig. 1. 



2 Geol. of Yorkshire, 2d part, pi. 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. 



