374 R. F. TOMES ON MADREPORARIA FROM THE LIAS OF 
ZOANTHARIA POROSA. 
Family PORITIDA. 
Subfamily PoriTinz. 
Genus Mrcrosotena, Lamx. 
MIcRosoLEnA, sp. 
Two specimens have been taken by me from the Sutton Stone, 
which though unquestionably referable to this genus, are not well 
enough preserved to permit of description. Both of them are 
imbedded in stone and can only be observed at the weathered sur- 
faces or by recent sections. It is evidently a tall species, one 
specimen, though incomplete, being fully 5incheshigh. The calices 
are large, round, and far apart, and when their septa meet those of 
other calices there is no disposition towards a parallel arrangement. 
No trace of columella is observable. The septa are thin and their 
perforations numerous. The synapticule are simple and not much 
developed. 
EXPLANATION OF PLATE XIX. 
Fig. 1. Thecosmilia rugosa, Laube: natural size; showing the dwarfed and 
clustered character of the species. Taken from a specimen from 
the White Lias, at Meer Hill, Loxley, two miles N.E. of Stratford- 
on-Avyon. 
2. Stylastrea plana, Duncan, sp. A greatly magnified representation of 
a horizontal section immediately under the calices, taken from a 
specimen from the Sutton Stone. This shows very satisfactorily 
the cylindrical form of the corallites, with their thin wall; the 
abundant ccenenchyma and the well-developed columella. These 
are characters which distinguish the genus Stylastrea, of which 
this appears to be a typical species. 
3. Cyathocenia decipiens, Laube, sp. Some calices, magnified, from a 
specimen taken by me from the Sutton Stone. 
4&5. Calamophyllia cassiana, Laube: natural size, from specimens taken 
by me from the Sutton Stone. 
; Some of the coste of fig. 4: magnified. 
7. Thecosmilia confluens, Laube. The representation of a fragment, 
natural size, taken from the White Lias, at Stoneythorpe, near 
Southam, Warwickshire. 
8. —— Hornesiti, Laube. The cast of a calice from the White Lias, at 
Wimpstone, near Stratford-on-Avon. 
9. Montlivaltia perlonga, Laube: natural size; from a specimen taken by 
me from the Sutton Stone. 
10. Cladophyllia subdichotoma, Laube. Represents a fragment from a con- 
fused mass of broken-up corallites from the Sutton Stone, most of 
which have a much more parallel arrangement than is shown in the 
portion figured. The corallites in this species are for the most part 
placed much more closely side by side than as shown in the figure. 
11. —— Some magnified calices of the same. In these the greater 
thickness of the primary cycle as compared with the other cycles is 
not sufficiently shown. 
Discussion. 
Dr. Duncan regretted the absence of the author of the paper. 
The corals brought from South Wales by Mr. Tawney were examined 
by the speaker, and several of them were recognized as St. Cassian 
