R. F. Tomes—On Heterastrea, Lower Lias. 213 
HetTerastrma Fromenrett, Terq. et Piette sp. Pl. VII. Fig. 4. 
Septastrea Fromenteli, Terq. et Piette, Lias Inf. de 1’ Est de la France, etc. 
—— , Duncan, Supp. Brit. Foss. Corr. pt. iv. p. 37, pl. xi. fig. 5. 
The example of a supposed Septastrea which was found in. the 
railway cutting at Harbury, and mentioned by Prof. Duncan, as 
above, has heen submitted to me by my friend Mr. Brodie, in whose 
collection it is, and a comparison has been made between it and 
other allied species. Two contiguous calices of this specimen are 
very remarkable, for on the margin of one there is gemmation, 
while the other is divided in half by the process of fissiparity. In 
no other species, or specimen, have I seen the two processes so 
closely associated or so obvious. Fissiparity is however much more 
frequent than gemmation in this specimen. 
As I have only had the opportunity of examining Hnglish 
specimens of this species, my observations must be understood to 
apply to them exclusively, though I have no doubt that the French 
and English specimens are of one species. 
HeTmRASTR#A STRICKLANDI, Dune., sp. Pl. VII. Fig. 8. 
Isastrea Stricklandi, Dune., Supp. Brit. Fos. Cor. pt. iv. p. 54, pl. vill. figs. 1-4. 
The type-specimen of this species was obtained by Mr. Strickland 
from the clay-pit of the Chadbury brickyard, from which excavation 
a considerable number of specimens of so-called Isastree and 
Septastree were taken, some of which agree very closely with the 
description of this species by Prof. Duncan. I have not, however, 
been able to examine the type-specimen. It does not appear to be 
a very abundant species, only three having come into my hands. 
Two of them came also from the Chadbury clay-pit, and the other 
was dug up by a market gardener when trenching his land on the 
side of the hill north of Evesham on which the battle of Evesham 
was fought. This species is distinguished, as pointed out by the 
original describer, by its stout septa and thick walls. The calices 
are rather shallow. There is no instance in either of my specimens 
of budding actually taking place, though there are calices which 
from their circular form and their position amongst other calices 
have certainly proceeded from marginal budding. Fissiparity is 
common, and sometimes occurs rather peculiarly. The division of 
a calice takes place all round it, and a very large lobular calice is the 
consequence, and when the dividing septa make their appearance, 
they have a somewhat radiate arrangement. 
HETERASTRHA INSIGNIS, Dunc., sp. 
Isastrea insignis, Dunc., Supp. Brit. Foss. Corr. pt. iv. p. 54, pl. xi. figs. 10, 11. 
The specimen on which Prof. Duncan established this species was 
obtained by me from the Lower Lias at Lyme Regis, but as the 
opportunity of making an examination of it since it has become a 
type has not occurred to me, 1 am compelled to fall back upon the 
other specimens from the same locality, of the specific identity of 
which, however, I entertain no doubt. Several similar specimens 
came into my hands with the one I lent to Prof. Duncan. These I 
