370 R. F. TOMES ON MADREPORARIA FROM THE LIAS OF 
the calices are more closely placed than in some of the others, the 
calices, by contact with each other, become more or less polygonal, 
and have the appearance of those of Astrocenia; yet even in such 
specimens portions will be observed which have more distinct 
calices (which are therefore separated by more coenenchyma), the 
calices of such portions being always circular. 
STYLASTR#A SINEMURIENSIS, E. de From. in Martin, Infra-Lias du 
Département de la Cote-d’or, p. 94, pl. vill. figs. 6-7. 
Astrocenia costata, Duncan, loc. cit. p. 21, pl. ix. figs. 15, 16, 17. 
Any doubt that may exist as to the identity of Strylastrea sine- 
murensis With Astroceenia costata will be readily removed by com- 
parison of fig. 7 of the former with fig. 16 of the latter species, 
in the works above quoted. It has only been met with in the 
Brocastle conglomerate, so far as I know. 
SrytastR#A Martini, HE. de From. loc. cit. p. 49, pt. vii. fig. 18. 
Astrocenia superba, Duncan, loc. cit. p. 21, pl. ix. figs. 3, 4, 5. 
After an examination of the type specimen of Astrocenia superba, 
I am perfectly satisfied of its identity with the previously described 
Stylastrea Martini, to which species I therefore refer it. The 
specimens examined have been obtained from Brocastle. 
STYLASTR#A PLANA, Duncan, sp. (Plate XIX. fig. 2.) 
Astrocenia plana, Duncan, loc. cit. p. 19, pl. v. fig. 1. 
The want of figures showing sections of the corallites and of 
other details of this species renders its identification much less easy 
than that of S. gibbosa, which has received at the hands of the 
describer more ample representation. Yet the present is the more 
typical species, and a magnified figure corresponding with the en- 
larged one of Stylastrea gibbosa, given by Prof. Duncan (pl. v. 
fig. 5), would show corallites which are more distinct, having walls 
much more clearly defined and circular, and a much more abundant 
cenenchyma. An enlarged figure, which I now give, will explain 
the differences thus pointed out. 
STYLASTRHA GIBBosA, Duncan, sp. 
Astrocenia gibbosa, Duncan, loc. cit. p. 18, pl. iv. fig. 3, pl. v. 
figs. 2, 3, 4, 12, pl. vi. figs. 1, 2, 3, 4. 
The present species, as well as the foregoing, is to be found in 
the Sutton Stone at Sutton, and both appear to be equally common ; 
but I have seen specimens from no other locality. 
STYLASTRHA REPTANS, Duncan, loc. cit. p. 20, pl. iv. figs. 4, 5, 6, 15. 
A single specimen from Sutton, by no means in a good state of 
