MIDDLE AND WESTERN ENGLAND AND SOUTH WALES. 365 
Tomesii from which Dr. Wright’s original description and figure of 
the species were taken, and around were countless numbers of Plica- 
tula intusstriata, which were either lying disengaged from the soft 
shale between. the stone beds, or cemented together into lumps. 
There was evidence of an oyster-bed, overlain, so far as I could ob- 
serve, by the bed from which the Thecosmilia and Hemipedina were 
derived. 
THECOSMILIA SERIALIS, Duncan, loc. cit. p. 12, pl. iv. figs. 10-12. 
I have met with several specimens of this coral, but always in a 
fragmentary state, and did not for some time determine them satis- 
factorily in consequence of their being, in every case, either in con- 
tact with, or surrounded by, corallites of Hlysastrea. The direct 
evidence of fissiparity observable in some of the elongated calices 
led to their distinction from those of Hlysastrea, with which I had 
confounded them. Hitherto it has only been met with in the 
Sutton Stone of Sutton and West. 
THECOSMILIA, sp. 
As already mentioned, a tall branching species of Thecosmiha 
occurs abundantly in a bed quite low down in the White Lias at 
Steven’s Hill near Long Sutton, Somerset. It appears as hollow 
tubes running vertically through the stone, and showing with great 
accuracy the epithecal and costal markings of the corallites which 
have occasioned them. ‘The impressions of the epitheca exhibit an 
excessively rugose character ; but as fragments only of the corallites 
remain in these hollow casts, the septal characters cannot be made 
out. 
THECOSMILIA sUTTONENSIS, Duncan, loc. cit. p. 11, pl. iv. figs. 7-9. 
Except for the method of increase, which is by gemmation, the 
present species would not have been considered by the original de- 
scriber as a distinct species. If gemmation were found to be its 
sole mode of increase, 1t would not only be specifically distinct, but 
very possibly generically also. Fragments are by no means rare in 
the Sutton Stone, and are nearly always found denuded of their epi- 
theca, which appears to have been very thin. 
THECOSMILIA MIRABILIS, Duncan, loc. cut. p. 12, plait. fies. 105 LI. 
This multiseptate species altogether conforms to the St. Cassian 
type; but appears to be specifically distinct from any of the species 
figured by Laube. So far as I can observe from the figures and 
description given by Prof. Duncan, it increases by gemmation and 
not by fissiparity, and a specimen in my own collection shows a 
much more rapid increase in the diameter of the corallum than 
appears in the figures just mentioned, and the calicular surface is 
consequently of greater extent than the same part of the specimen 
from which Prof. Duncan’s figure was taken. 
Q.J.G.8. No. 159. 2¢ 
faa Se 
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