722 R. F. TOMES ON THE OOLITIC 
of the Upper Kimmeridge. It differs from all the specimens of 
T. concinna I have seen, whether from the Corallian of France, 
Nattheim, Steeple Ashton, Highworth, Lyneham, or Headington, in 
having the calices smaller, and all their parts more delicately formed. — 
The calices in the worn example are circular, and rather far apart. 
There are 6 septa, and a columella which is rather less strongly 
developed than in 7. concinna. 
Although distinct from 7’, concinna (as may be at once seen by its 
having only one cycle of septa), the present species has so essentially 
a Coral-Rag aspect as to point at once to its being the lingering 
remains of the coral fauna of the Corallian. 
Genus MicrosoLtena, Lamx. 
Mrcrosotena Expansa, Etallon, Etudes Paléont. sur le Haut Jura, 
p. 125. 
In the very thin and plate-like form of its corallum, and in the 
small number and delicacy of its septa, and in their arrangement 
in groups, a single specimen from the Coral Rag of Hourecgq cor- 
responds very well with the JMcrosolena expansa of M. Etallon. 
The greatest thickness of the specimen does not exceed 3 lines, and 
its greatest expanse is 2 inches. Although so thin, it is composed 
of a great number of very thin and superimposed layers. 
MicROsoLENA Sp. 
A species from the Coral Rag of Houllefort which bears some 
resemblance to Muicrosolena regularis in the size and arrange- 
ment of the septa, differs considerably from that species in 
having much larger calices, which are, however, less distinctly 
defined. The corallum, too, presents considerable difference in its 
form, being subturbinate, and formed by a series of successive layers 
which have an irregular lobular outline. 
Genus Comoseris, d’Orbigny. 
CoMOSERIS IRRADIANS, Milne-Edwards and Haime, Brit. Foss. Cor, 
p. LOL, pl xix: fies 1 (iso): 
Specimens from the Coral Rag of the Mont des Boucards and 
Hourecq do not differ in any important respect from those from the 
Coral: Rag of this country. 
In conclusion, I wish to record my very sincere thanks to M. 
Rigaux for the unreserved manner in which he placed in my hands, 
not only his collection of specimens, but also his notes of their localities 
and position, and allowed me to make such use of them as I found 
necessary. Excepting for his liberality, the present communication 
would have been most incomplete and unsatisfactory. 
