ACTIXOPOEA. 
9 
Rays composed of biserial zooecia. The rays are very numerous, 
and there may be four or five orders. In young zoaria the 
rays are proportionately broader than in old zoaria. 
Some zoaria are compound, consisting of several sub-colonies 
growing in the same sheet. 
Dimexsioxs. 
Diameter of disc 
Thickness of disc 
Number of rays 
Diameter of apertures 
Var. qaudryana . 
D\ 4582. 
PI. I. Fig. 3. 
3‘5 X 3-0 mm. 
•4 mm. 
18 
•06--08 mm. 
The chief sub -colony 
in D. 3427, a 
compound zoariuni 
from Maastricht. 
9x10 mm. 
16 
•08 mm. 
Disteibutiox. 
English : 
Upper Chalk — Zone of Belemnitella mucronata : Clarendon, Wilts {fideNvo.^). 
Zone of Micraster coranyninum : Gravesend ; south-east of 
England ; Dover ; Bromley, Kent. 
Middle Chalk — Zone of M. cortesfndinarinm’. Chatham. 
Fokeigx : 
Danian: Annetorp, Sweden {fide Ileunig). 
Senonian — Maastrichtian : Maastricht; Iloyan, Charente-Inferieure. 
Campanian : Meudon, near Paris ; Heims {fide Peron). Also 
Seine- Inferieure {fide Bucaille) ; Ignaberga, BaLsberg, 
O. Karup, etc., Sweden {fide Henuig). 
Santouian : Saintes, Charente-Inferieure ; Bomorantin, Loir- 
et-Cher. 
Coniacian : Vendome and Yilledieu, Loir-et-Cher ; Tours and 
St. Christophe, Indre-et-Loire. 
Senouian general: Veules, Seine- Inferieure ; Bougniaux and 
Pons, Charente-Inferieure ; Merpins, Charente. 
Fig. 11 . — Actinopora disticha\ x 3. 
