CORALS FROM THE INFERIOR OOLITE. 141 
3. TuamnastrEA Merrensis. Tab. XXX, figs. 3, 3a. 
Corallum explanate ; its upper surface flat or slightly convex ; and its common basal 
plate covered with an epitheca presenting concentric wrinkles. Ca/ices superficial, rather 
closely set, and forming, near the edge of the compound corallum, concentric series in each 
of which the corallites are more approximated than in the contrary direction. Co/umella 
rudimentary. Sepa closely set, varying in thickness alternately, and not much genicu- 
lated ; between sixteen and twenty-four round each fossula; the tertiary ones often become 
united to the secondary ones along their inner edge. Breadth of the calices two les. 
Found in the Inferior Oolite at Crickley, near Cheltenham, by Dr. Wright ; and at 
St. Quentin, near Metz, by M. Terquem. 
In this fossil the columella is quite rudimentary, and appears even to be quite deficient in 
many of the corallites. Z. Meftensis differs in that respect from most species of Tham- 
nastrea, in which a papillose columella is usually visible in the centre of the calice. In 
T. Defranciana' the columella is also very obscurely defined, but the septa are thinner than 
in the above-described species. 
4, THAMNASTREA FUNGIFoRMIS. Tab. XXX, figs. 4, 4a. 
Corallum fungiform, pedunculate, and terminated by a convex surface. Calices some- 
what unequal in size; the largest rather prominent. Sep/a about fifty in number, 
somewhat unequally developed alternately, thin, closely set, and wregularly denticulated 
at their upper edge. Breadth of the calices from two to three lines. 
Found in the Inferior Oolite at Charlcomb, by Mr. Walton. 
We have seen but a few ill-preserved specimens of this species, which appears to be 
very nearly allied to 7. arachnoides, but differs from it by its septa being more numerous 
and more deeply denticulated. 
5. Tuamnastrea M‘Coyr. Tab. XXIX, figs. 2, 2a. 
We have not been able to refer to any known species this fossil, of which we have seen 
but a single specimen in a very bad state of preservation, and much worn ; its walls are 
polygonal, and circumscribed ; calices of unequal size, in the centre of which a columella 
appears to have existed. The septa, from twenty to twenty-four in number, are unequally 
1 Tab. xxix, fig. 3. 2 Tab. xxx, fig. 2. 3 Tab. xvii, fig. 1. 
