ON THE BRITISH FOSSIL CORALS. 1 
monest species of the zone of Ammonites angulatus have not been found in 
any of its strata. 
It is probable that Thecosmilia Martini, E. de From., which in France 
ranges from the beds containing Ammonites Moreanus into those in which 
Ammonites bisulcatus is found, has a corresponding vertical range in England. 
Thecosmilia Michelini, Terq. et Piette, appears to be present in the zone of 
Ammonites bisulcatus ; but as yet only casts of its specimens, which resemble 
those of the species from Abbot’s Wood in the zone of Ammonites angulatus, 
have been found. These casts, and some of Thecosmilia Martini, have been 
assigned to the genus Cladophyllia, but without sufficient reason. Thecosmilia 
is a large genus, and of course the species present individuals of all sizes; so 
that to give to small cylindroid Thecosmilie the generic appellation of 
Cladophyllia is unreasonable. In fact this last genus is but a subgenus of 
Thecosmilia at the best. 
Iist of Species from this Zone. 
. Montlivaltia Guettardi, Blainville. 5. Isastraca insignis, Duncan. 
- Septastrzea Eveshami, Duncan. 6. Stricklandi, Duncan. 
. Lepidophyllia Stricklandi, Duncan. 7. Cyathoceenia globosa, Duncan. 
. Lsastreea endothecata, Duncan. 
He Co bo 
Septastrea Eveshami has very irregular calices; and when the wall has 
been worn away between them, a groove is seen indicating that separation of 
the corallites which I have already noticed to obtain in the Zlysastree. The 
species is rather abnormal ; for although fissiparity is common, still there is 
a disposition to serial increase. 
The genus Jsastrea has three well-marked species in this zone, and they 
are very distinct from those of the zone of Ammonites angulatus. In Isastreea 
endothecata the depth of the calices, the extraordinary development of the 
endotheca, and the great number and the irregularity of the septa are differ- 
ential. Jsastrea Stricklandi also has a great development of endotheca; for 
large plates of it cross the corallites, and shut in the calicular fosse below, 
acting perfectly like tabulze, just as in Cyathaphora. The septa are few in 
number ; and no cyclical arrangement is to be noticed. 
Isastrea insignis belongs to a section of the genus which comprises J. 
Henocquei, Ed. & H., from the Hettangian, J. polygonalis, Muschelkalk, and 
I, Lonsdalei, Ed. & H., from the Inferior Oolite. 
A new genus, Lepidophyllia, has a species in this zone, and avery fine one 
in the zone of Ammonites Jamesoni: it is an interesting form, and presents 
some Rugose characteristics, such as a repeated calicular gemmation and an 
epithecate wall. 
The only Montlivaltia I have seen from the zone of Ammonites Bucklandi 
has a lower horizon on the continent. Having thus a very considerable 
vertical and geographical range, the species is, of course, very variable, and 
many local varieties have been found, which are separated with difficulty from 
Montlivaltia Haimet. These flat multiseptate Montlivaltiv are very charac- 
teristic of the Lower Lias. They have a representative in the zone of Ammo- 
nites obtusus, in the form of M. patula, Duncan, whose dentate septa are 
wonderful. Such septa began then to be the fashion ; for in the next zone 
the Montlivaltic are famous for their grandly ornamented dentations. 
Corals from the Zone of Ammonites raricostatus. 
The Montlvaltic from Fenny Compton, Honeybourne, and Cheltenham 
belong to several species, and two of these are singularly polymorphic. 
Shape has not much to do with the specific diagnosis of some recent simple 
