MIDDLE AND WESTERN ENGLAND AND SOUTH WALES. 355 
infilling of stony matter into the interseptal loculi, which has been 
laid bare by the removal of the wall, and thus appears in the form 
of rounded cost. Specimens of Montlivaltie in a corresponding 
condition to that of M. Murchisonie are by no means uncommon 
in the Lower Trigonia-grit of the Inferior Oolite in the neighbour- 
hood of Cheltenham. Montlivaltia polymorpha and M. pedunculata 
are nothing more than fragments of composite genera, which will 
be hereafter mentioned. TYhecosmilia similis is another species of 
which nothing definite can be said, owing to the unfavourable state 
of preservation of the type specimen. Of Astrocenia favoidea and 
A. sinemuriensis, introduced by Prof. Duncan into the list of British 
species, I am unable to speak; nor can I give any opinion on the 
coral described, but not figured, by that zoophytologist, under the 
name of Latemeandra denticulata. 
Corals of the White Lias. 
Throughout a great part of the area in Warwickshire which is 
occupied by the Lias, the White Lias, or upper part of the Rhetic 
formation, is seen underlying it, and in many places is found to be 
very fossiliferous, the fossils usually being in a bad state of preser- 
vation. ‘The few remains of corals observable in it, though in some 
instances fairly preserved, are much more frequently mere impres- 
sions of their calices. That some of these are identical with St. 
Cassian species I shall endeavour to show, and at the same time 
point out their identity with species which have been described by 
Prof. Duncan from the Sutton Stone of Glamorganshire. 
The localities in Warwickshire where the White Lias may be 
most satisfactorily studied are in the neighbourhood of Rugby, 
Southam, Loxley, and Katington. West of the river Stour, which 
passes into the Avon about a mile from Stratford-on-Avon, the White 
Lias is not seen, excepting at a few points in the county and the 
adjoining county of Worcester, as at Wimpstone, Crimscot, and 
Armscot. It is worthy of remark that, whenever in the district 
above indicated the lower part of the Rhetic deposit has been ex- 
posed and examined, it is seen to be of an arenaceous nature and 
almost wholly without organic remains. At a few places only is 
this condition reversed, and its usual sandy nature indicates that it 
was deposited near to a coast-line and in shallow water; while the 
existence of some highly conglomeratic beds in the lower part of the 
overlying White Lias points to nearly the same conclusion*, Almost 
the whole of the Madreporaria I have collected from the last-men- 
tioned formation in Warwickshire have been taken from these lower 
conglomeratic beds; but I believe that the small discoid Month- 
valtia I have distinguished by the name of MM. rhetica occurs a 
little higher up than the others. 
A few miles to the westward, in the neighbourhood of Stratford- 
on-Avon, the White Lias is wholly wanting, and other beds come 
* See some remarks on the slow deposition of the White Lias by the late 
Mr. C. Moore, in the 17th volume of the Quarterly Journal of the Geological 
Society, p. 496. 
aes 
