250 BRITISH FOSSIL CORALS. 
and of equal size; their diameter about one eighth of a line. Diameter of the calices about 
two thirds of a line. 
This species has been found in the inferior Silurian beds at Applethwaite and Caradoc. 
Sir R. Murchison has found it also at Marloes Bay, in Pembrokeshire. _ It exists also in the 
upper Silurian deposits at Wenlock and Dudley; and in Ireland. The British localities 
mentioned by Sir R. Murchison as presenting this fossil, are—Aymestry, Rutter Edge, 
Wenlock Edge, Lincoln Hill, Benthall Edge, Haven near Aymestry, Lindell’s Park, 
the Ledbury, Delves Green, and Walsall. Professor M‘Coy points out its existence in the 
Coniston limestone of Long Steddale, Westmoreland; and in Galway, Kerry, Mayo, and 
Dublin. It is also met with at Nehou and Viré, in France; in Gothland, in Russia, and in 
North America. Mr. Hall has recently found it m the Niagara limestone at Lockport, and 
at Milwaukie, Wisconsin. 
H. interstincta much resembles /. porosa,! with which many authors have confounded 
it; but it differs from that species by the calices being much more closely set, and by the 
polygonal divisions of the ccenenchyma being proportionally much smaller. 
We are inclined to think that the fossil corals which Professor M‘Coy mentions as 
beimg extremely abundant in the calcareous schists and limestone of Craig Head, Ayrshire ; 
Girvan ; and in the fine Caradoc limestone of Mulock Quarry, Dalquorhan, Ayrshire, and 
designates under the name of Pa/gopora favosa, are ill-preserved specimens of the above- 
described species. 
2. Hexriorires Murcnisoni. Tab. LVII, figs. 6, 6a, 64, 6c. 
Funerres, Thomas Pennant, Philos. Trans., vol. xlix, 2d part, p. 513, tab. xv, fig. 2, 1757. 
CoMPOUND MaDREPORITE, Parkinson, Org. Rem. of a Form. World, vol. 11, pl. vii, fig. 10, 1808. 
PALHOPORA INTERSTINCTA, var. SUBTUBULATA, M‘Coy, Brit. Paleeoz. Foss., p. 16, pl. ic, 
fig. 2, 1851. 
Hewiotires Murcuisoni, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz. 
(Arch. du Mus., vol. v), p. 215, 1851. 
Corallum composite, massive, irregularly circular; its upper surface convex, and its 
under surface in general free, and presenting strongly-marked circular rugose ridges. 
Calices equally developed in the same specimen, and varying but little in size in different 
specimens ; about half a line in diameter; their margin very thin, and scarcely exsert, but 
quite distinct from the surrounding coenenchyma; and in some of the well-preserved 
corallites, 12 small septa, somewhat unequally developed alternately, are visible. The 
calices are not closely set, and vary in their degree of approximation; the space between 
! See tab. xlvii, fig. 1. 
2 British Paleeoz. Fossils, p. 15, tab. ic, fig. 15.—Ann. and Mag. of Nat. Hist., 2d series, vol. vi, 
p- 285 (1850). 
