R. F. Tomes—On Heterastreea, Lower Lias. 215 
is a low expanding form, sometimes attaining to a great size. The 
largest I have yet seen is almost as heavy as a man can lift. On 
nearly every part of this massive specimen the line where the 
corallites come into contact with each other is very visible, 
and in some places there appears to be a slight but perceptible 
interval between the walls. Marginal budding is frequent, and 
fissiparous division of the calices is observable everywhere. Some 
of the calices are more than an inch in length, and have a very 
remarkable and almost serpentine form, with four or five fossule, 
the long dividing septa being present between some of them, but 
not between others. At one place rejuvenescence occurs in several 
contiguous calices, and they appear as double, or one within the 
other, just as they appear in the upper part of Laube’s figure of 
Elysastrea, and here and there a corallite, near the outside of the 
corallum, is elevated above the rest and there is a trace of an after- 
growth of epitheca. 
HETERASTRHA LATIMHANDROIDEA, Dune. sp. 
Isastrealatimeandroidea, Duncan, Supp. Brit. Fos. Cor. pt. iv. p. 65, pl. xxv. figs. 18, 19. 
The specimen of this species, which was obtained by Dr. Wright 
from the Ammonites planorbis bed of Street, was for some time in my 
hands, and a facsimile in plaster, taken by means of a wax im- 
pression, is now before me. Marginal gemmation is obviously very 
abundant, and the elongated calices having more than one fossula, 
are indicative of fissiparity. The specimen is only a fragment and 
its specific independence is very doubtful. 
HETERASTRHA ? SINEMURIENSIS, From. sp. 
Isastrea sinemuriensis, E. de From. in Martin, Pal. Strat. de l’Infra Lias, Cote d’Or. 
Isastre@a sinemuriensis, Duncan, Supp. Brit. Foss. Cor. pt. iv, p. 80, pl. vil. figs. 1-9. 
If the Brocastle specimens are rightly identified with this species, 
then it, like so many other of the so-called Isastree of the Lias, 
increases by marginal instead of calicinal gemmation. This is 
evident in my specimen, and it has also been figured by Prof. 
Duncan (Supp. Brit. Foss. Cor. as above) from specimens in the 
collection of the late Mr. Charles Moore. 
Of Isastreea gibbosa from the same locality I can only say that in 
the specimens I have examined there was no evidence of any process 
of increase. 
HeErTERASTRMA EXCAVATA, Fromentel, sp. 
Septastrea excavata, BH. de From. in Martin, Infra Lias, Cote d’Or. 1860. 
Two specimens of a Coral which I refer to this species have come 
into my hands, both of which were taken from the low-lying gravel 
at Charlton, about a mile north-west of Evesham. They resemble 
each other in having a regularly oval form, and are somewhat 
depressed, though they have an evenly convex calicular surface. A 
larger example than either of these would, if broken up, furnish 
precisely such fragments as the one figured by M. de Fromentel. 
In all the details of the form, size, and arrangement of the corallites 
and their calices, as well as the development of the septa, my 
