108 REPORT—1868. 
There is a species of Latimcandrea in the British zone of Ammonites angulatus, 
L. denticulata, Duncan ; its calices are very like the serial calices of Jsastrea 
latemeandroidea. 
I have already noticed that probably Astrocenia gibbosa, nobis, is really 
a form from Azzarola, for the casts of both are very alike. Now there is an 
Astroccenian in the St.-Cassian, A. Oppeli, Laube ; it is unfortunately hardly 
specifically differentiated, but it is evidently closely allied to the Astrocenia 
of the Sutton stone, as well as to A. Sinemuriensis, D’Orb., sp., trom the 
French zone of Ammonites angulatus. This last species is also hardly suffi- 
ciently differentiated; but I have placed it amongst the British species 
provisionally. 
There are eleven species of Astrocenia special to the Welsh Lias, and the 
species just noticed. The genus was evidently flourishing in the St.-Cassian 
and Azzarolan times, and was singularly abundant in species amongst the 
Lower Liassic reefs at Sutton and Brocastle, to which the Mountain Limestone 
formed the support. 
The Liassic Astroceenie occur as large and massive, small and dendroid, or 
as irregular and, sometimes, as incrusting forms. All the species are very 
irregular in their septal arrangements, and none of them present definite and 
clear cycles of septa. 
Some of the species have the ccoenenchyma between the calices irregularly 
ridged, so as to present the first traces of that coenenchymal development 
which characterizes the genus Stylocenia. The columella is very distinct in 
all the species, and the junction of the largest septa to it is marked in some 
forms by a paliform swelling; but there are no pali. The dentate condition of 
the septal edge is very marked. The size of the corallum, its shape and habit, 
the size of the calices, the character of the cost, and the density, thickness, 
and ornamentation of the free portion of it appear to differ in various forms, 
and separate eleven new species from those already described. 
The following is a scheme of the Astrocenie from the zone of Ammonites 
angulatus, at Sutton and Brocastle. 
Astrocenia. 
| gibbous-and tall............... Astroceenia gibbosa, Duncan. 
(fee «x4 Hab BNE SHOLL scyceessse scree { == Pailin Dine 
| [ short and irregular outline septans, Duncan. 
: MNGRISHINE Swe ner cna erasers: parasitica, Duncan. 
Corallum......  pecunculate, with epitheca.. —— pedunculata, Duncan. 
| GOROTOIGN je coset dec cscs Sach ure dendroidea, Duncan. 
small ...{ flat and narrow ............... superba, Duncan. 
plobose-e.stctesestaceeteaceetne: favoidea, Duncan. * 
Tha qe eq VG) dion enecting, inane ae Reno costata, Duncan. 
flat and semiincrusting ...... minuta, Duncan. 
(ces Astrocoenia fayoidea. 
MLUY westesistessccetartes iene 
| ( parasitica. 
| dendroidea. 
: AUUTIGCANG sete sss ceaviet-sa2 superba. 
Corallum haying the cenenchyma { se er cudulia. 
| insignis. 
| ( —— septans. 
1 costata. 
\ moderately developed { _— gibbora. 
{ —— plana. 
