94 
OSCFLIPORID^. 
Apertures cover the whole obverse surface, except in young zoaria 
and near the distal ends of the branches, where they open 
in a raised sinuous ridge ; branches from the zooecial ridge 
extend along the pinnules. 
Gonoecium elliptical, tumid, with several apertures. Situated 
on the obverse surface. (In D. 4365 it is situated near the 
base of the zoarium.) 
Dimensions. 
Long pinnuled variety. 
D’Orbigny. 
B.M. 
D. 3968. 
PI. II. Fig. 9. 
B.M. 
D. 4365. 
Zoarium: height ... 
mm. 
3d 
mm. 
over 4- 3 
mm. 
over 5 
,, diameter of branches ... 
2 
•8 
•8 
,, diameter of lateral pro- 
cesses... 
•5 
•37 
•35-1 
, , length of lateral processes 
about 1 
1 
•5-1-5 
,, average distance of pin- 
nules ... 
1 
about 1 
1-2 
Zocecia: diameter... 
•09--1 
•14 
•08--14 
,, diameter of apertures ... 
— 
00 
o 
•07--08 
i 
Distribution. 
British : 
Upper Chalk — Zone of Micraster coranguiniim ; Gravesend ; Dover. 
Middle Chalk — Zone of M. cortestudinarium : Chatham. 
Chalk : Beachy Head ; Caterham. 
Foreign : 
Senonian : Les Boches, Loir-et-Cher. 
? Cenomanian: St. Calais, Sarthe,(/c^<? Canu). 
Figures. 
PI. II. Fig. 9. Obverse face of a fragment of a zoarium of 
variety with long pinnules; X 11 dia. Middle Chalk — zone 
of Micraster cortestudinarium : Chatham. Gamble Coll. D. 3968. 
PI. II. Fig. 10. Obverse face of fragment of a zoarium with 
long pinnules; X 11 dia. Middle Chalk — zone of Micraster 
cortestudinarium : Chatham. Gamble Coll. D. 3968. 
