362 R. F. TOMES ON MADREPORARIA FROM THE LIAS OF 
Paleontological evidence of the age of the Sutton Stone would, no 
doubt, be conclusive, if no uncertainty existed respecting the precise 
spot from which the fossils were obtained. But the difficulty of 
collecting specimens, excepting corals, and the doubt as to their 
position, owing to the diversity of opinion of the several collectors 
respecting the definition of the Sutton Stone proper, diminishes very 
greatly the value of their evidence. Moreover, as I have already 
stated, the upper Rheetic beds of some localities, as in Warwickshire, 
contain such a very large percentage of Hettangian Mollusca, as to 
render it quite necessary that a very complete collection should be 
examined. Unless this is done the small number of characteristic 
species would probably be overlooked. The Hettangian character 
of the Mollusca at present recorded from the Sutton Stone, is not 
therefore sufficient proof of its non-Rhetic relationship ; while the 
corals, like those from the Warwickshire White Lias, unquestion- 
ably indicate a Rhetic period. At the same time, however, that 
which I have stated at p. 354 respecting the value of the evidence 
afforded by the presence of corals may apply here, and point to a 
period during which they flourished on the upturned edges of the 
Mountain Limestone prior to the deposition of the Sutton Stone. 
Of the Brocastle corals it may be distinctly affirmed that their 
affinity is with Infra-Liassic or Hettangian forms, some of them 
having been described in the works of Martin, Dumortier, and Ter- — 
quem, although they are at present associated with organisms of a 
later date. When, however, we remember that a conglomerate has, 
so to speak, two dates, one when first deposited, and another when 
redeposited, we shall experience less difficulty in explaining the 
apparent anomalies presented by both the Sutton and Brocastle 
conglomerates. 
ZOANTHARIA APOROSA 
Family ASTRAIDA. 
Subfamily Asrrainz. 
Genus Monriivatria, Lamx, 
MowTLIVALTIA PERLONGA, Laube, FaunaSt. Cassian, Abth. i. Denkschr. 
k.-k. Akad. Wiss. Wien, Bd. xxiv. p. 249, Taf. ii. fig. 13. 
(Pl. XTX. fig. 9.) 
A few flattened and otherwise ill-preserved specimens of a Mont- 
livaltia of small size have been met with in the Sutton Stone at 
Sutton. Of these the most that I can say is, that in the general 
form of the corallum they bear considerable resemblance to the 
Montlivaltia perlonga of Laube, and that, as in that species, they were 
attached by a small space, and have a rudimentary epitheca which 
scarcely conceals the coste. From Laube’s figure, however, they 
differ in being rather less tall. 
